From historical data, Harrys Car Wash estimates that dirty

From historical data, Harry’s Car Wash estimates that dirty cars arrive at the rate of 10 per hour all day Saturday. With a crew working the wash line, Harry figures that cars can be cleaned at the rate of one every 5 minutes. One car at a time is cleaned in this example of a single-channel waiting line. Assuming Poisson arrivals and exponential service times, find theA.) average number of cars in lineB.) average time a car waits before it is washedC.) average time a car spends in the service systemD.) utilization rate of the car washE.) probability that no cars are in the system