Normally distributed output: What is true about the mean of

A process when in control produces a normally distributed output with a mean of 200 and a range of 20. Ten samples of 20 each yield the following means and ranges.
Sample 1 2 3 4 5 6 7 8 9 10
X-Bar 200 202 201 204 203 203 201 201 202 201
Range 19.0 20.0 20.2 20.7 19.0 21.1 19.0 20.1 20.3 21.7

Which of the following is most true concerning the mean of the process?
A. the mean is out of control
B. the mean is in control
C. the probability of this pattern is the process were in control is very high, therefore we infer the process is in control.
D. the probability of this pattern if the process were in control is very low, therefore we infer that the process is out of control.

Solution Summary

Correct Answer with relevant explanation is provided.

A corporation owns a factory that produces sulfuric acid. Because of changing
conditions, the plant's output is quite variable. The company's president has observed that the output is normallydistributed with a mean of 8,200 pieces per hour. He recently has been informed that the government is considering a new law that would

Please see attachment for more clarification on Q5
1. Indicate whether the following statements are true or false.
a) The time to failure of a component is distributed as follows (pdf):
1. Indicate whether the following statements are true or false.
a) The time to failure of a component is distributed as follows (pdf

1. What shape would your distribution histogram be if the variable is approximately normallydistributed?
2. True or False. As the amount of confidence increases, the required sample size should decrease. Explain your answer.

1. CRP assigns work to the next available machine rather than the one that can perform the job most efficiently.
a. true b. false
2. For a set number of jobs to be processed on one machine, SPT will always minimize average number of jobs in the system.
a. true b. false
3. In sequencing j

An AC-AC converter is used to obtain a variable AC output voltage Vo from a fixed AC source and a single-phase converter with a TRIAC.
a. True
b. False

Please can someone give some ideas, even if they don't know the final solution?
A firm receives a price of 120 for its output. Its total cost function is C=.02Q^3 +.4Q^2 - 5Q - 15.
a) Assuming the utility operates to maximize profits, what is this firm's profit maximizing output level?
I know we have to use the qu

Given the following table:
Complete the following table (round each answer to the nearest whole number):
Total Variable Fixed Marginal Average Avg. Var. Avg. Fixed
Output Cost Cost Cost Cost Cost Cost Cost
0
1 5
2 30
3 13
4 105 10
5 110
6 50
Complete the table then

88. If it is true that handling the mail does not get cheaper as the volume of mail increases, which of the following best explains this fact?
A) The Post Office is run by the government and therefore is inefficient.
B) The rule "the bigger the volume, the lower the cost" is true only if other things remain the same; since