Repair calls Suppose that the appliance shop in Exercise 29 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...

Repair calls Suppose that the appliance shop in Exercise 29 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