Bryce? Dodson's Car Wash is open 6 days a? week, but its busiest day is always Saturday. From historical? data, Bryce estimates that dirty cars arrive at the rate of 20 per hour all day Saturday. With a full crew working the? hand-wash line, he figures that cars can be cleaned at the rate of one every 2 minutes. One car at a time is cleaned in this example of a? single-channel waiting line. Assume Poisson arrivals and negative exponential service times. ?a) The average number of cars in line is cars ?(round your response to two decimal? places).