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Chapter 7: Q. 79 (page 434)
The average wait time is:
a. one hour.
b. two hours.
c. two and a half hours.
d. four hours.
The average wait time is two hours. Therefore, option "b" is the correct answer.
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A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find the th percentile for the sums.
According to Boeing data, the airliner carriespassengers and has doors with a height of inches. Assume for a certain population of men we have a mean height of inches and a standard deviation of inches.
a. What doorway height would allow of men to enter the aircraft without bending?
b. Assume that half of the passengers are men. What mean doorway height satisfies the condition that there is a probability that this height is greater than the mean height ofmen?
c. For engineers designing the , which result is more relevant: the height from part a or part b? Why?
A manufacturer produces -pound lifting weights. The lowest actual weight is pounds, and the highest is pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of weights is taken.
Find the percentile for the mean weight for the weights.
Yoonie is a personnel manager in a large corporation. Each month she must review of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of hours. Let 围 be the random variable representing the time it takes her to complete one review. Assume 围 is normally distributed. Let be the random variable representing the meantime to complete the reviews. Assume that the 16 reviews represent a random set of reviews.
Find the probability that the mean of a month鈥檚 reviews will take Yoonie from to hrs. Sketch the graph, labeling and scaling the horizontal axis. Shade the region corresponding to the probability.
a.
b. P(________________) = _______
A manufacturer produces -pound lifting weights. The lowest actual weight is pounds, and the highest is pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of weights is taken.
Draw the graph from Exercise
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