Repair calls. Suppose that the appliance shop in Exercise 23 plans an 8-hour day. a) Find the

Question:

Repair calls. Suppose that the appliance shop in Exercise 23 plans an 8-hour day.

a) Find the mean and standard deviation of the number of repair calls they should expect in a day.

b) What assumption did you make about the repair calls?

c) Use the mean and standard deviation to describe what a typical 8-hour day will be like.

d) At the end of a day, a worker comments, “Boy, I’m tired.

Today was sure unusually busy!” How many repair calls would justify such an observation.

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