minutes. The time between customers arriving at a book store is exponentially distributed with a mean of 5 (a) What is the probability that no customers arrive during a 30-minute period? (5) (b) If the store opens at 9:00, what is the probability that the first customer of the day arrives between 9:10 and 9:20? (6) (c) If the store opens at 9:00, what is the probability that the first customer arrives at exactly 9:15? (4 ) [15] QUESTION 5