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Chapter 7: Q.14 (page 428)
Find the sum that is standard deviations below the mean of the sums.
The required sum is.
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The average wait time is:
a. one hour.
b. two hours.
c. two and a half hours.
d. four hours.
Based on data from the National Health Survey, women between the ages of and have an average systolic blood pressures (in mm Hg) of with a standard deviation of . Systolic blood pressure for women between the ages of to follow a normal distribution.
a. If one woman from this population is randomly selected, find the probability that her systolic blood pressure is greater than
b. Ifwomen from this population are randomly selected, find the probability that their mean systolic blood pressure is greater than .
c. If the sample were four women between the ages ofto and we did not know the original distribution, could the central limit theorem be used?
Find the probability that the average price for gas stations is less than .
a.
b.
c.
d.
e.
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 reviews represent a random set of reviews.
Find the th percentile for the meantime to complete one month's reviews. Sketch the graph.
a.
b. The th Percentile =____________
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-hour search 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 reviews represent a random set of reviews
Complete the distributions.
a. X~ _____(_____,_____)
b. ~ _____(_____,_____)
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