111 Customers arrive at Paul Harrold's Styling Shop at a rate of 3 per hour, distributed in a Poisson fashion. Paul can perform haircuts at a rate of 5 per hour, distributed exponentiay. a) Find the average number of customers waiting for haircuts. b) Find the average number of customers in the shop. c] Find the average time a customer waits until it is his or her turn. d] Find the average time a customer spends in the shop. e) Find the percentage of time that Paul is busy