Please hold The customer care manager at a cell phone company keeps track of how long each help-line caller spends on hold before speaking to a customer service representative. He finds that the distribution of wait times for all callers has a mean of 12.8 minutes with a standard deviation of 7.2 minutes. The distribution is moderately skewed to the right. Suppose the manager takes a random sample of 45 callers and calculates their mean wait time x. What is the shape of the sampling distribution of x for samples of size n = 45 from this population? Justify. Calculate the probability that the mean wait time x is more than 15 minutes.
Please hold The customer care manager at a cell phone company keeps track of how long each help-line caller spends on hold before speaking to a customer service representative. He finds that the distribution of wait times for all callers has a mean of 12.8 minutes with a standard deviation of 7.2 minutes. The distribution is moderately skewed to the right. Suppose the manager takes a random sample of 45 callers and calculates their mean wait time x. What is the shape of the sampling distribution of x for samples of size n = 45 from this population? Justify. Calculate the probability that the mean wait time x is more than 15 minutes.
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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
Transcribed Image Text:Please hold The customer care manager at a cell
phone company keeps track of how long each
help-line caller spends on hold before speaking to
a customer service representative. He finds that the
distribution of wait times for all callers has a mean
of 12.8 minutes with a standard deviation of 7.2
minutes. The distribution is moderately skewed to the
right. Suppose the manager takes a random sample of
45 callers and calculates their mean wait time x.
What is the shape of the sampling distribution of
x for samples of size n = 45 from this population?
Justify.
Calculate the probability that the mean wait time
is more than 15 minutes.
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