A company services home air conditioners. It has been found that times for service calls follow a
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Question:
A company services home air conditioners. It has been found that times for service calls follow a Normal distribution with a mean of 60 minutes and a standard deviation of 10 minutes. A random sample of four service calls was taken.
a. What is the probability that the sample mean service time is more than 65 minutes?
b. The probability is 0.10 that the sample mean service time is less than how many minutes?
Related Book For
Statistics for Business and Economics
ISBN: 978-0132930192
8th edition
Authors: Paul Newbold, William Carlson, Betty Thorne
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