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.