Answer:
D. 33%.
Step-by-step explanation:
The gross margin (markup rate) can be calculated as follows:
Gross margin = (selling price - cost price) / selling price
In this case, the cost price of the skillet is $20 and the selling price is $30, so:
Gross margin = ($30 - $20) / $30
= $10 / $30
= 0.33 or 33%
Therefore, the answer is D. 33%.
A grocery store claims that customers spend an average of
6
minutes waiting for service at the store's deli counter. A random sample of
60
customers was timed at the deli counter, and the average service time was found to be
6.5
minutes. Assume the standard deviation is
1.9
minutes per customer. Using
αequals=0.10
complete parts a and b below.
a. Does this sample provide enough evidence to counter the claim made by the store's management?
Determine the null and alternative hypotheses.
Upper H 0H0:
muμ
▼
nothing
Upper H 1H1:
muμ
▼
nothingThe z-test statistic is
nothing.
(Round to two decimal places as needed.)
The critical z-score(s) is(are)
nothing.
(Round to two decimal places as needed. Use a comma to separate answers as needed.)
Because the test statistic
▼
▼
reject
do not reject
the null hypothesis.
b. Determine the p-value for this test.
The p-value is
nothing.
(Round to three decimal places as needed.)
The required z-test statistic is 2.45 and p-value for this test is approximately 0.014
Given,
Population mean waiting time for service, μ = 6 minutes
Sample size, n = 60
Sample mean waiting time for service is, M = 6.5 minutes
Population standard deviation is, σ = 1.9 minutes
To determine the p-value for this test.
Since it is claimed that customers spend an average of 6 minutes waiting for service at the store's deli counter; therefore, the appropriate null and the alternate hypothesis are:
H0:μ=6
Ha:μ≠6
This corresponds to a two-tailed test.
Since the population standard deviation is known; therefore, the z-test is appropriate.
Assuming the null hypothesis true, the calculated z-value is obtained as:
z=M−μ/(σ/√n)=6.5−6/(1.9/√60)≈2.446
Therefore, the required calculated z-value is approximately 2.45.
The two-tailed p-value corresponding to the z-value of 2.45 is:
p−value≈ .014286
Therefore, the required p-value for this test is approximately 0.014
(rounded to three decimals).
The result is significant at p < 0.10.
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Questions According to a study. 74% of students prefer online exams to in-class exame Suppose that 21 students are randomly selected How Roly is that fower than 12 of these students profer online 6 points cm Round to four decimal places O 0269 1.5731 Оe erbs Od 9300 inte
The probability that fewer than 12 of the 21 randomly selected students prefer online exams is 0.0269, or 2.69%.
According to a study, 74% of students prefer online exams to in-class exams. If 21 students are randomly selected, you want to know the probability that fewer than 12 of these students prefer online exams.
To answer this question, we can use the binomial probability formula:
P(x) = C(n, x) × pˣ × (1-p)^(n-x)
where:
- P(x) is the probability of having exactly x successes in n trials
- C(n, x) is the number of combinations of n items taken x at a time
- n is the number of trials (21 students in this case)
- x is the number of successful trials (students preferring online exams)
- p is the probability of success (0.74, the percentage of students preferring online exams)
Since we want the probability of fewer than 12 students preferring online exams, we need to calculate the sum of probabilities for x = 0 to 11:
P(x < 12) = Σ [C(21, x) × 0.74ˣ × (1-0.74)⁽²¹⁻ˣ⁾] for x = 0 to 11
Using a calculator or statistical software to compute the probabilities, the sum of the probabilities for x = 0 to 11 is approximately 0.0269.
So, the probability that fewer than 12 of the 21 randomly selected students prefer online exams is 0.0269, or 2.69%.
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What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
The probability of obtaining 4 ones in a row when rolling a fair, six-sided die is 0.00077.
The probability of obtaining a one on any given roll of a fair, six-sided die is 1/6, since there is one outcome corresponding to rolling a one out of a total of six possible outcomes (rolling any one of the numbers 1 through 6).
By the multiplication rule for independent events, we can calculate this probability by multiplying the probabilities of each individual event:
P(rolling four ones in a row) = P(rolling a one on the first roll) × P(rolling a one on the second roll) × P(rolling a one on the third roll) × P(rolling a one on the fourth roll)
P(rolling four ones in a row) = (1/6) × (1/6) × (1/6) × (1/6)
P(rolling four ones in a row) = 1/6^4
P(rolling four ones in a row) = 1/1296
Therefore, the probability of obtaining four ones in a row when rolling a fair, six-sided die is approximately 0.00077, or about 0.077% (rounded to three decimal places).
This probability is very small, which means that it is unlikely to obtain four ones in a row when rolling a die. In fact, it would take an average of 1/0.00077 or about 1296 rolls to obtain four ones in a row.
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Circle
M
has points
A
,
B
,
Y
, and
Z
on the circle. Secant lines
X
Z
―
and
X
Y
―
intersect at Point
X
outside the circle. The
m
Z
Y
⌢
=
112
∘
and
m
A
B
⌢
=
2
x
+
3
. The
m
∠
Z
X
Y
=
20
∘
.
Answer: did u find out the answer yet
Step-by-step explanation:
The mean cholesterol level for all Americans is 190. We want to show that the mean cholesterol level for only children is higher than 190. In a random sample of 35 children, the mean cholesterol level is 193 with a standard deviation of 14. Conduct a hypothesis test at the α = 0.05 significance level.
a. Compute the test statistic and P- value. Round to 4 decimal places.
To approximate the change in volume, we can use the formula for the total differential of the volume:
dV = (∂V/∂r)dr + (∂V/∂h)dh
where (∂V/∂r) and (∂V/∂h) are the partial derivatives of V with respect to r and h, respectively.
Using the formula for the volume of a cone, we have:
∂V/∂r = 2πrh/3
∂V/∂h = πr^2/3
Plugging in the given values, we get:
∂V/∂r = 2π(6.7)(4.17)/3 ≈ 56.13
∂V/∂h = π(6.7)^2/3 ≈ 74.44
Now we can approximate the change in volume:
dV ≈ (∂V/∂r)Δr + (∂V/∂h)Δh
≈ (56.13)(6.7 - 5.9) + (74.44)(4.17 - 4.20)
≈ 60.03
Therefore, the approximate change in volume is dv = 60.03 (rounded to two decimal places).
Note: The units for dv would be cubic units, depending on the units used for r and h.
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The function used in excel to find the "line of best fit" is trendline dataline sales residual plot
The function used in Excel to find the "line of best fit" is called "Trendline". To add a trendline to a chart, you can right-click on a data series in the chart and select "Add Trendline" from the drop-down menu.
A trendline is a line that shows the general pattern or direction of a set of data. It's also known as a line of stylish fit or a retrogression line. A trendline can be added to a map in Excel to help fantasize the relationship between two variables and to make prognostications grounded on the data.
When you add a trendline in Excel, you have the option to choose from several different types of retrogression models, similar as direct, exponential, logarithmic, polynomial, power, and moving average. Each type of model fits a different type of data pattern, and it's important to choose the applicable model for your data. In addition to adding a trendline, Excel also provides a residual plot to help you assess the virtuousness of fit of the trendline.
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Suppose the true proportion of voters in the county who support a new fire district is 0.52. Consider the sampling distribution for the proportion of supporters with sample size n = 212. What is the mean of this distribution? What is the standard error of this distribution?
To find the mean of the sampling distribution for the proportion of supporters with sample size n = 212, we use the formula: Mean = True Proportion = 0.52. The standard error of this distribution is 0.048.
Based on your question, we need to find the mean and standard error of the sampling distribution for the proportion of supporters with a sample size of n = 212.
The true proportion of voters who support the new fire district is given as p = 0.52. The complement, which represents those who do not support the fire district, is q = 1 - p = 1 - 0.52 = 0.48.
Mean of the sampling distribution: The mean of the sampling distribution for the proportion is equal to the true proportion, which is p. Therefore, the mean is 0.52.
Standard error of the sampling distribution: The standard error of the sampling distribution for the proportion is calculated using the formula SE = sqrt(p * q / n), where p is the true proportion, q is its complement, and n is the sample size.
SE = sqrt(0.52 * 0.48 / 212) = sqrt(0.2496 / 212) = sqrt(0.001176) ≈ 0.0343
So, the mean of the sampling distribution is 0.52, and the standard error is approximately 0.0343.
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a newspaper took a random sample of 1000 registered voters and found that 550 would vote for the green party candidate for governor. is this evidence that more than 1/2 of the entire voting population would vote for the green party candidate? to answer this question, you will have to test the hypothesis versus . assume a type i error rate of . what is the associated standard score for this hypothesis test?
The associated standard score for this hypothesis test is 3.16. There is is evidence that more than 1/2 of the entire voting population would vote for the green party candidate for governor.
To determine whether the random sample of 1000 registered voters showing 550 votes for the Green Party candidate is evidence that more than half of the entire voting population would vote for the Green Party candidate, we will conduct a hypothesis test with the null hypothesis H0: p ≤ 0.5 and the alternative hypothesis Ha: p > 0.5. We will assume a Type I error rate of 0.05.
The steps to determine the standard score are as follows:1: Calculate the sample proportion (p):
p = 550/1000 = 0.55
2: Calculate the standard error (SE):
SE = sqrt[(p * (1 - p))/n] = sqrt[(0.55 * 0.45)/1000] ≈ 0.0158
3: Calculate the z-score (standard score) for the hypothesis test:
z = (p - p₀) / SE = (0.55 - 0.5) / 0.0158 ≈ 3.16
4. From the p-value table, the p-value is 0.00078885
The associated p-value for this z-score is extremely small (less than 0.001), which means we can reject the null hypothesis H0: p ≤ 0.5 and conclude that there is evidence to support the alternative hypothesis Ha: p > 0.5.
The associated standard score is approximately 3.16. Therefore, this is evidence that more than 1/2 of the entire voting population would vote for the green party candidate.
Note: The question is incomplete. The complete question probably is: a newspaper took a random sample of 1000 registered voters and found that 550 would vote for the green party candidate for governor. Is this evidence that more than 1/2 of the entire voting population would vote for the green party candidate? to answer this question, you will have to test the hypothesis H0: p ≤ 0.5 versus Ha: p > 0.5. assume a type i error rate of 0.05. What is the associated standard score for this hypothesis test?
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If Dustin distributes all of the liquid equally among the 7 bottles, how much liquid will be in each bottle?
When Dustin distributes all of the liquid equally among the 7 bottles the amount in each bottle is 0.85 units.
What is dot plot?A dot plot is a form of graph that uses dots along a number line to show how frequently data values occur. Each data value is represented as a dot in a dot plot, which is placed above the corresponding spot on the number line. The dots are piled vertically to illustrate the frequency of a value when many data values fall on the same spot on the number line. When displaying and analysing small to medium-sized data sets, dot plots are frequently employed since each data value may be simply represented by a dot on a number line.
From the graph we see that the amount of liquid in each bottle is:
0 units in one bottle.
1/2 units in three bottles = 3(1/2) = 3/2.
1 units in one bottle.
1 1/2 = (2 + 1) / 2 = 3/2 units in one bottle.
2 units in one bottle.
Now, the total amount of liquid is:
T = 0 + 3/2 + 1 + 3/2 + 2 = 6 units.
When the 6 units is divided among 7 bottles we have:
6 / 7 = 0.85
Hence, when Dustin distributes all of the liquid equally among the 7 bottles the amount in each bottle is 0.85 units.
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1. Use the partial sums to determine if the following series converges or diverges. Σ n=1 ln (n+2)/n2. Confirm your answer in 1. using the nth term test for series.
The given series [tex]\sum_{n=1}^{\infty} \frac{\ln(n+2)}{n^2}[/tex] diverges.
To determine if the given series converges or diverges, we can use the partial sums and the nth term test for series.
Partial Sums
The nth partial sum of the given series is denoted by S_n and is given by:
S_n = Σ k=1 to n ln(k+2)/k²
Nth Term Test for Series
The nth term of the given series is denoted by a_n and is given by:
a_n = ln(n+2)/n²
According to the nth term test for series, if the limit of the absolute value of a_n as n approaches infinity is zero, then the series converges. Mathematically, this can be expressed as:
lim (n->∞) |a_n| = 0
Applying the Nth Term Test
Let's calculate the limit of |a_n| as n approaches infinity:
[tex]\lim_{{n \to \infty}} \left| \frac{{\ln(n+2)}}{{n^2}} \right|[/tex]
Using L'Hospital's rule, we can find the limit of the ratio of the natural logarithm and the quadratic function:
[tex]\lim_{{n\to\infty}} \left| \frac{\ln(n+2)}{n^2} \right| = \lim_{{n\to\infty}} \frac{1}{\frac{n+2}{2n}}[/tex]
Now, we can simplify the expression:
[tex]\lim_{{n\to\infty}} \left(\frac{1}{\frac{n+2}{2n}}\right) = \lim_{{n\to\infty}} \left(\frac{2n}{n+2}\right)[/tex]
Applying L'Hospital's rule again, we get:
[tex]\lim_{{n \to \infty}} \left( \frac{2n}{n+2} \right) = \lim_{{n \to \infty}} \left( \frac{2}{1} \right) = 2[/tex]
Since the limit of |a_n| as n approaches infinity is not equal to zero, we can conclude that the series [tex]\sum_{n=1}^{\infty} \frac{\ln(n+2)}{n^2}[/tex]does not converge to a finite value.
Therefore, the given series [tex]\sum_{n=1}^{\infty} \frac{\ln(n+2)}{n^2}[/tex] diverges.
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∫(0 to 4) 1/(sqrtx(1+sqrtx)) dx is
A ln 3
B ln 5
C 2 ln 3
D divergent
The integral ∫(0 to 4) 1/(sqrt(x)(1+sqrt(x))) dx is equal to 2 ln(3), which corresponds to option C.
How to find whether integral is divergent or convergent?To determine whether the integral ∫(0 to 4) 1/(sqrt(x)(1+sqrt(x))) dx is divergent or convergent, and find its value, follow these steps:
Step 1: Make a substitution
Let u = sqrt(x), so x = u^2 and dx = 2u du.
The integral now becomes:
∫(0 to 2) 1/(u(1+u)) * 2u du
Step 2: Simplify the integral
The integral simplifies to:
∫(0 to 2) 2/(1+u) du
Step 3: Integrate the function
Integrate the simplified function with respect to u:
∫(0 to 2) 2/(1+u) du = 2 ∫(0 to 2) 1/(1+u) du = 2[ln(1+u)](0 to 2)
Step 4: Evaluate the definite integral
Evaluate the definite integral using the limits:
2[ln(1+2) - ln(1+0)] = 2[ln(3) - ln(1)] = 2(ln(3) - 0) = 2 ln(3)
So, the integral ∫(0 to 4) 1/(sqrt(x)(1+sqrt(x))) dx is equal to 2 ln(3), which corresponds to option C.
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determine how many square inches of paint she will need for those sides.
The square inches of paint that will be needed for the sides is 3858.45 sq in
Determining the square inches of paint that will be needed for the sides.From the question, we have the following parameters that can be used in our computation:
The pentagonal prism
The square inches of paint that will be needed for the sides is the surface area of the pentagonal, and this is calculated as
Area = 5ah + 1/2√[5(5+2√5)]a²
Where
a = side length = 27 inches
h = height = 10 inches
Substitute the known values in the above equation, so, we have the following representation
Area = 5 * 27 * 10 + 1/2√[5(5+2√5)] * 27²
Evaluate
Area = 3858.45
Hence, the square inches of paint that will be needed for the sides is 3858.45 sq in
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A(n). is a general, tentative explanation that proposes explanations for observed behavior that can be used to predict future outcomes, whereas a(n) between two or more variables that is to be tested. is a specific prediction about the relationship
prediction; experiment
theory, hypothesis
outcome, theory
hypothesis; theory
A hypothesis is a tentative explanation that predicts the relationship between two or more variables to be tested, whereas a theory is a more general and established explanation that predicts future outcomes.
What is hypothesis?A hypothesis is a statement or proposition that is assumed to be true in order to prove or disprove a theorem or conjecture through logical reasoning and mathematical proof.
What is theory?A theory is a systematic and coherent set of concepts, principles, and mathematical models that explain a wide range of related phenomena and make predictions that can be tested and verified through experimentation or observation.
According to the given information:
In scientific research, a hypothesis is a specific prediction or statement that proposes a possible relationship between two or more variables, which can be tested through experimentation or observation. It is a tentative explanation that seeks to explain an observed behavior or phenomenon, and it can be used to guide future research and experimentation.
On the other hand, a theory is a more general and comprehensive explanation of an observed behavior or phenomenon that has been tested and supported by numerous experiments and observations. A theory can be thought of as a well-established and widely accepted explanation that can be used to predict future outcomes and guide further research.
To summarize, a hypothesis is a specific prediction that can be tested through experimentation or observation, while a theory is a more general and established explanation that has been supported by numerous experiments and observations.
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Evaluate the integral: S1 0 (1+1/2u⁴ - 2/5u⁹)du
The value of the integral is 1710. To evaluate the integral S1 0 (1+1/2u⁴ - 2/5u⁹)du, we need to integrate each term separately.
∫1du = u + C, where C is the constant of integration.
To integrate 1/2u⁴, we can use the power rule of integration:
∫1/2u⁴ du = (1/2) ∫u⁴ du = (1/2) * u⁵/5 + C = u⁵/10 + C
To integrate -2/5u⁹, we can also use the power rule of integration:
∫(-2/5)u⁹ du = (-2/5) ∫u⁹ du = (-2/5) * u¹⁰/10 + C = -u¹⁰/25 + C
Putting everything together, we have:
∫(1+1/2u⁴ - 2/5u⁹)du = ∫1du + ∫1/2u⁴ du - ∫2/5u⁹ du
= u + u⁵/10 - (-u¹⁰/25) + C
= u + u⁵/10 + u¹⁰/25 + C
Now, we can evaluate the definite integral by plugging in the limits of integration:
S1 0 (1+1/2u⁴ - 2/5u⁹)du = [u + u⁵/10 + u¹⁰/25]₁⁰
= (10 + 10⁵/10 + 10¹⁰/25) - (0 + 0⁵/10 + 0¹⁰/25)
= 10 + 1000 + 400000/25
= 10 + 1000 + 16000
= 1710
Therefore, the value of the integral is 1710.
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1. Find the value of c to make the expression a perfect square, type the number where c is. Then write an equivalent expression in the form of squared factors.
2. Solve the equation by completing the square. Show your reasoning.
4x^2 - 38x = -33
(1) The value of c that makes the equation a perfect square is 196 and the expression in factor form is 4(x - 7)².
(2) The value of x using completing the square method is x = ¹/₄ (19 ± √229).
What is the value of c that will make the equation perfect?To make the equation a perfect square trinomial, we need to take half of the coefficient of x and square it, and then add that result to the expression.
4x² - 28x + c
The coefficient of x is -28,
= ¹/₂(-28) = -14.
(-14)² = 196.
Therefore, the value of c that makes the equation a perfect square trinomial is 196.
So, the expression in factor form is;
4x² - 28x + 196 = 4(x - 7)²
2. The solution of the equation by completing the square method;
4x² - 38x = -33
x² - (38/4)x = -33/4
half of coefficient of x = -38/8, the square = (-38/8)²;
(x - 38/8)² = -33/4 + 361/16
(x - 38/8)² = 229/16
x - 38/8 = ±√ (229/16)
x = ±√229/4 + 38/8
x = ±√229/4 + 19/4
x = ¹/₄ (19 ± √229)
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If EH=3a–74 and GH=a–4, find the value of a that makes quadrilateral DEFG a parallelogram.
If a = 17.5, quadrilateral DEFG will be a parallelogram.
What is quadrilateral?
A quadrilateral is a geometric shape that has four sides and four vertices (corners). The angles formed by the sides of a quadrilateral add up to 360 degrees. Some common examples of quadrilaterals include squares, rectangles, parallelograms, trapezoids, and kites.
For a quadrilateral to be a parallelogram, opposite sides must be parallel.
Therefore, EF || DG and DE || FG.
Since EF and DG are both horizontal, they must have the same y-coordinate.
So, EF = DG = 18.
Also, DE and FG are both vertical, so they must have the same x-coordinate.
So, FG = DE = 2a - 17.
Since DE and FG are equal, we have:
2a - 17 = 18
Solving for a, we get:
a = 17.5
Therefore, if a = 17.5, quadrilateral DEFG will be a parallelogram.
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In order to test the reliability p for
certain missiles, that is, p is the probability for a randomly selected missile to hit the target,
four missiles were fired and all hit the targets. Such a test is usually very expensive, and thus
the sample size is very small. Give a conservative one-sided 95% lower confidence interval for p.
We can conclude that the one-sided 95% lower confidence interval for the probability of a missile hitting its target is 0 to 1, which is not a very useful or informative result.
To find the confidence interval, we first need to calculate the sample proportion, which is the number of successes (missiles that hit the target) divided by the total number of trials (missiles fired). In this case, all four missiles hit the targets, so the sample proportion is 4/4 = 1.
Next, we use the formula for calculating a confidence interval for a proportion:
p ± zα/2 * √(p(1-p)/n)
where p is the sample proportion, zα/2 is the critical value from the standard normal distribution corresponding to the desired level of confidence (in this case, 95%), and n is the sample size.
Since we are looking for a lower confidence interval, we can use a one-sided normal distribution instead of a two-sided distribution. In this case, the critical value is -1.645, which we can find using a standard normal distribution table or a calculator.
Plugging in the values, we get:
1 - 1.645 * √((1*0)/4) ≤ p ≤ 1
Simplifying the expression, we get:
0 ≤ p ≤ 1
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According to police sources a car with a certain protection system will be recovered 78% of the time. Find the probability that 3 of 8 stolen cars will be recovered.
The probability that 3 of 8 stolen cars will be recovered is 0.296 or approximately 0.30.
The given problem involves a binomial distribution, where the probability of success (recovering a stolen car) is p = 0.78 and the number of trials is n = 8. We need to find the probability of getting exactly 3 successes.
The probability of getting exactly k successes in n trials can be calculated using the binomial probability formula:
P(k successes) = (n choose k) * [tex]p^k[/tex] * [tex]{1-p}^{n-k}[/tex]
where (n choose k) represents the binomial coefficient, which can be calculated as:
(n choose k) = n! / (k! * (n-k)!)
where n! represents the factorial of n.
Using the above formula with k = 3, n = 8, and p = 0.78, we get:
P(3 successes) = (8 choose 3) * 0.78³ * (1-0.78)⁵
= 56 * 0.78³ * 0.22⁵
= 0.296
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For the given cost function C(x) = 44100 + 600x + x2 find: a) The cost at the production level 1700 b) The average cost at the production level 1700 c) The marginal cost at the production level 1700 d) The production level that will minimize the average cost e) The minimal average cost For the given cost function C(x) = 62500 + 300x + x², First, find the average cost function. Use it to find: a) The production level that will minimize the average cost = b) The minimal average cost $ If 1900 square centimeters of material is available to make a box with a square base and an open top, find the largest possible volume of the box. Volume cubic centimeters.
a) C(x) = 3954100
b) Average cost = 2325.94117
c) Marginal cost = 4000
d) Minimizing average cost = 210
e) Minimum average cost = 1020
What is the cost function?
A loss function, also known as a cost function, is a function used in mathematical optimization and decision theory that transfers an event or the values of one or more variables onto a real number that intuitively represents some "cost" connected to the occurrence. A loss function is the goal of an optimization problem.
Here, we have
Given: Given cost function C(x) = 44100 + 600x + x².
a) The average cost at the production level is 1700.
C(x) = 44100 + 600(1700) + (1700)²
C(x) = 44100 + 1020000 + 2890000
C(x) = 3954100
b) C(x) /x = Average cost
= C(1700) /1700 = 3954100/1700
= 2325.94117
c) dc/dx = 600 + 2x
x = 1700
dc/dx = 600 + 2(1700)
= 600 + 3400
= 4000
d) For minimizing average cost
[tex]\frac{d(C(x)}{dx}[/tex] = [tex]\frac{d}{dx}[44100/x + 600 + x] = 0[/tex]
= -44100/x² +1 = 0
x = √44100
x = 210
e) Minimum average cost
C(210)/210 = 214200/210
= 1020.
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question two polygons are similar. the perimeter of the smaller polygon is 48 centimeters and the ratio of the corresponding side lengths is 23 . find the perimeter of the other polygon.
If the perimeter of the smaller polygon is 48 centimeters and the ratio of the corresponding side lengths is 2:3, the perimeter of the larger polygon is 72 centimeters.
If two polygons are similar, it means that their corresponding angles are congruent and their corresponding sides are proportional. Let's denote the perimeter of the larger polygon as P.
Since the ratio of the corresponding side lengths is 2:3, we can set up the following proportion:
2/3 = perimeter of smaller polygon / perimeter of larger polygon
Solving for the perimeter of the larger polygon, we get:
perimeter of larger polygon = (3/2) x perimeter of smaller polygon
perimeter of larger polygon = (3/2) x 48
perimeter of larger polygon = 72
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please help with grade 10 math!!!
(a) The length of /AC/ is 12 m
(b) The length of /AG/ is 12.5 m
(c) The angle line AG makes with the floor is 16.3°
What is length?
Length is the distance between two points.
(a) To calculate the length AC of the cuboid, we use the formula below
Formula:
/AC/ = √(AB²+BC²).......................... Equation 1Where:
AB = 7.2 mBC = 9.6 mSubstitute these values into equation 1
/AC/ = √(7.2²+9.6²)/AC/ = √(51.84+92.16)/AC/ = √144/AC/ = 12 m(b) Similarly, to calculate the value of AG, WE use the formula below
/AG/ = √(AB²+BC²+CG²)..................... Equation 2Where:
/AB/ = 7.2 m/BC/ = 9.6 m/CG/ = 3.5 mSubstitute these values into equation 2
/AG/ = √(7.2²+9.6²+3.5²)/AG/ = √(51.84+92.16+12.25)/AG/ = √(156.25)/AG/ = 12.5 m(c) Finally, to find the angle that AG make to the floor, we use the formula below
cosα = Adjacent/Hypotenus = AC/AGGiven:
/AC/ = 12 m/AG/ = 12.5 mSubstitute these values into equation 3
cosα = 12/12.5cosα = 0.96α = cos⁻¹(0.96)α = 16.3°Learn more about length here: https://brainly.com/question/28108430
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Which set of numbers could represent the lengths of the sides of a right triangle? Responses 8, 12, 16 8, 12, 16 16, 32, 36 16, 32, 36 3, 4, 5 3, 4, 5 9, 10, 11
Answer:The set of numbers that could represent the lengths of the sides of a right triangle is 3, 4, 5.This is because these numbers satisfy the Pythagorean theorem, which states that in a right triangle, the sum of the squares of the two shorter sides (legs) is equal to the square of the longest side (hypotenuse). In other words, for a right triangle with legs a and b and hypotenuse c, a² + b² = c².In the case of 3, 4, 5, we have:3² + 4² = 9 + 16 = 25 = 5²So, these numbers could represent the lengths of the sides of a right triangle.The other sets of numbers, 8, 12, 16 and 16, 32, 36, and 9, 10, 11, do not satisfy the Pythagorean theorem and therefore cannot represent the lengths of the sides of a right triangle.
Step-by-step explanation:
A die is rolled 18 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the standard deviation for the random variable X, the number of twos.
The standard deviation for the random variable X will be 1.5811.
The number of twos that come up in 18 rolls of a die is a binomial random variable, denoted by X, with parameters n=18 and p=1/6 (since the probability of rolling a two on any one roll is 1/6).
The mean of a binomial distribution is given by μ = np, and the variance is given by σ^2 = np(1-p). Thus, in this case, we have:
μ = np = 18 × 1/6 = 3
σ^2 = np(1-p) = 18 × 1/6 × (1 - 1/6) = 2.5
The standard deviation is the square root of the variance, so:
σ = √(2.5) = 1.5811 (rounded to four decimal places)
Therefore, if this experiment is repeated many times, we would expect the number of twos to have a mean of 3 and a standard deviation of approximately 1.5811.
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For each question, please state the appropriate statistical test being used: I.e : (t - test for independent samples, z scores, single sample t test, t test for related samples, pearson correlation, Chi-square goodness of fit, Chi-square test for independence).1. A university president believes that, over the past few years, the average age of studentsattending his university has changed. To test this hypothesis, an experiment is conducted inwhich the age of 150 students who have been randomly sampled from the student body ismeasured. The mean age is 23.5 years. A complete census taken at the university a few yearsbefore the experiment showed a mean age of 22.4 years, with a standard deviation of 7.6.Using a = 0.05, what can the president conclude?State the appropriate statistical test:H0:H1:df (if appropriate) and Critcal Value:State Results, Decision, and Conclusions:
There is not enough evidence to conclude that the average age of students attending the university has changed at a significance level of 0.05.
Let's break down the problem and identify the appropriate statistical test, the null and alternative hypotheses, the degrees of freedom (if applicable), the critical value, and finally, the results, decision, and conclusions.
State the appropriate statistical test:
Since we are comparing the sample mean to a known population mean and the population standard deviation is given, we will use a single sample z-test.
H0 (Null Hypothesis): The average age of students has not changed (µ = 22.4 years)
H1 (Alternative Hypothesis): The average age of students has changed (µ ≠ 22.4 years)
Degrees of freedom (df) is not applicable in this case as we are using a z-test.
Critical Value:
Using a significance level (α) of 0.05 and a two-tailed test, the critical z-scores are -1.96 and 1.96.
Results:
To calculate the test statistic, use the formula: z = (sample mean - population mean) / (population standard deviation / sqrt(sample size))
[tex]z = (23.5 - 22.4) / (7.6 / sqrt(150)) = 1.1 / (7.6 / 12.25) ≈ 1.798[/tex]
Decision:
Since the calculated z-score (1.798) is within the critical values range (-1.96 and 1.96), we fail to reject the null hypothesis.
Conclusions:
There is not enough evidence to conclude that the average age of students attending the university has changed at a significance level of 0.05.
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Can someone answer this question please?
Answer: The slope of the line is 7
Step-by-step explanation:
y=mx+b, in this m is always the slope
So in y=7x+16, 7 is the slope
4. (8 points) Use calculus and algebra to find the inflection points of f(x) = sin (3x + 5). Be sure to justify your work (you are welcome to check your answer in desmos).
The inflection points of f(x) = sin (3x + 5) are x ≈ -3.363 and x ≈ -0.928.
To find the inflection points of f(x) = sin (3x + 5), we need to take the second derivative of the function and set it equal to zero.
f(x) = sin (3x + 5)
f'(x) = 3cos(3x + 5)
f''(x) = -9sin(3x + 5)
Setting f''(x) = 0 and solving for x:
-9sin(3x + 5) = 0
sin(3x + 5) = 0
3x + 5 = nπ, where n is an integer
x = (nπ - 5)/3
These are the potential inflection points. To determine if they are actual inflection points, we need to check the sign of f''(x) around each point.
Consider x = (nπ - 5)/3.
For x < (nπ - 5)/3, we have
3x + 5 < nπ
3x + 5 + 2π < (n+2)π
sin(3x + 5 + 2π) = sin(3x + 5)
cos(3x + 5 + 2π) = cos(3x + 5)
Therefore, f''(x) = -9sin(3x + 5) changes sign from positive to negative as x passes through (nπ - 5)/3, so this is an inflection point.
Checking with desmos, we see that there are two inflection points:
x ≈ -3.363, x ≈ -0.928
Therefore, the inflection points of f(x) = sin (3x + 5) are x ≈ -3.363 and x ≈ -0.928.
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Assume that the heights of men are normally distributed. A random sample of 19 men have a mean height of 65.5 inches and a standard deviation of 3.0 inches. Construct a 99% confidence interval for the population standard deviation,
An newly opened restaurant is projected to generate revenue at a rate of R(I) = 120000 dollars/year for the next 6 years. If the interest rate is 3.9%/year compounded continuously, find the future value of this income stream after 6 years. Enter you answer to the nearest dollar
The value of the principal investment would be = $12,500.75
We know that,
A principal investment is defined as the capital amount of money that is being deposited into an account with the purpose of receiving interest for a particular period of time.
The years of investment (t) = 9 years
The annual interest rate (r) = 3.9% = 3.9/100= 0.039
The total worth of the investment (A) = $17,757.16
Then, solve the equation for P
P = A / ert
P = 17,757.16 / e(0.039*9)
P = $12,500.75
Therefore, the principal amount that is needed which can be compounded continuously to get the total amount given = $12,500.75
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complete question:
After 9 years in an account with a 3.9% annual interest rate compounded continuously, an investment is worth a total of $17,757.16. What is the value of the principal investment? Around the answer to the nearest penny.
what percent of the class completed the homework if 12 papers were collected out of a class of 20 students?
Answer:
60%
Step-by-step explanation:
12 / 20 students did the homework
12 / 20 = 3 / 5 = 0.6
0.6 as a percent is 60%
So, 60% of the class did the homework
Use the following regression equation regarding professor salaries to answer the question. Salary = 95000 +1280 (Years) Note that Years is the number of years a professor has worked at a college, and Salary is the annual salary (in dollars) the professor earns. Interpret the slope in the context of the data. A) The slope is 95000 For every additional year a professor works at a college, his/her salary is predicted to increase by $95,000 $1,280. B) The slope is 1280. If a professor has never worked at a college, his/her salary is expected to be C) The slope is 1280. For every additional year a professor works at a college, his/her salary is predicted to increase by $1,280. D) The slope is 95000. If a professor has never worked at a college, his/her salary is expected to be $95,000.
The correct interpretation of the slope in the context of the data is that for every additional year a professor works at a college, his/her salary is predicted to increase by $1,280.
The given regression equation for professor salaries is Salary = 95000 + 1280 (Years), where "Years" represents the number of years a professor has worked at a college, and "Salary" represents the annual salary (in dollars) the professor earns. The slope of 1280 in the regression equation represents the change in Salary for each unit increase in Years.
Therefore, for every additional year a professor works at a college, his/her salary is predicted to increase by $1,280. This means that as a professor gains more experience and works for more years at a college, their salary is expected to increase by $1,280 per year, according to the given regression equation.
Therefore, the correct interpretation of the slope is: For every additional year a professor works at a college, his/her salary is predicted to increase by $1,280.
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