8.52 The service times for customers coming through a checkout counters in a retail store are independent

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8.52 The service times for customers coming through a checkout counters in a retail store are independent random variables with a mean of 15 minutes and a variance of 4. At the end of the work day, the manager selects independently a random sample of 100 customers each served by checkout counters A and B. Approximate the probability that the sample mean service time for counter A is lower than that for counter B by 5 minutes.

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Probability And Statistics For Engineers

ISBN: 9781133006909

5th Edition

Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr

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