Customers arrive at Rich Dunn's styling shop at a rate of 4 per hour, distributed in a poisson fashion. Service times follow an exponential distribution, and Rich can perform an average of 5 haircuts per hour. The average number of customers waiting for haircuts = 3.2 customers The average number of customers in the shop=4 customers The average time a customers waits until it is his or her turn = minutes The average time a customer spends in the shop = minutes The percentage of time that Rich is bus v= percent