We can now address questions first posed by Anne Jones in the introductory case of this chapter. Recall that Anne is concerned about staffing needs at the Starbucks that she manages. She has specific questions about the probability distribution of customer arrivals at her store. Anne believes that the typical Starbucks customer averages 18 visits to the store over a 30-day month. She wants answers to the following probabilities:

a. How many visits should Anne expect in a 5-day period from a typical Starbucks customer?

b. What is the probability that a customer visits the chain five times in a 5-day period?

c. What is the probability that a customer visits the chain no more than two times in a 5-day period?

d. What is the probability that a customer visits the chain at least three times in a 5-day period? L05