The Hair Port is a hair-styling salon at Riverside Mall. 4 stylists are always available to serve customers on a first-come, first-served basis. Customers arrive at an average rate of 3 per hour (Poisson distributed), and the stylists spend an average of 50 minutes (exponentially distributed) on each customer.
Determine the average number of customers in the salon, the average time a customer must wait (in minutes) and the average number waiting to be served. (Round answers to 2 decimal places, e.g. 2.75.)