The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean
of 9.7 minutes and a standard deviation of 2.2 minutes. What is the probability that for a randomly chosen customer with a complaint, the amount of time spent resolving the complaint
will be as follows. (Round your answers to four decimal places.)

(a) less than 10 minutes
(b) longer than 5 minutes
(c) between 6 and 15 minutes