Chapter 7: Q. 78 (page 433)
a.
b.
c.
d.
Short Answer
. Therefore, option "a" is the correct answer.
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Chapter 7: Q. 78 (page 433)
a.
b.
c.
d.
. Therefore, option "a" is the correct answer.
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The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
Find the 80th percentile for the total length of time 64 batteries last .
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 x- be the random variable representing the meantime to complete the reviews. Assume that the reviews represent a random set of reviews.
What causes the probabilities in Exercise andExercise to be different?
According to the Internal Revenue Service, the average length of time for an individual to complete (keep records for, learn, prepare, copy, assemble, and send) IRS Form is hours (without any attached schedules). The distribution is unknown. Let us assume that the standard deviation is two hours. Suppose we randomly sample taxpayers.
a. In words,
b. In words,
c.
d. Would you be surprised if the taxpayers finished their Form s in an average of more than hours? Explain why or why not in complete sentences.
e. Would you be surprised if one taxpayer finished his or her Form in more than hours? In a complete sentence, explain why.
Find the percentage of sums betweenstandard deviations below the mean of the sums and one standard deviation above the mean of the sums.
The percent of fat calories that a person in America consumes each day is normally distributed with a mean of about and a standard deviation of about ten. Suppose that individuals are randomly chosen. Let role="math" localid="1648361500255" average percent of fat calories.
a. _____ (______, ______)
b. For the group of , find the probability that the average percent of fat calories consumed is more than five. Graph the situation and shade in the area to be determined.
c. Find the first quartile for the average percent of fat calories.
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