(B) The mean service time is exponentially distributed. The mean service time is 8 minutes. A customer arrives for service at 1:00 pm. What is the probability the customer will complete service before 1:15 pm?

(C) The situation is the same as in problem (B). Now a customer arrives for service at 2:00 pm. When it is 2:15 pm the customer's service has not completed. What is the probability the customer's service will be completed after 2:30 pm?