Problem: The airport branch of a car rental company maintains a fleet of 50 SUVs. The inter-arrival time between requests for an SUV is 2.4 hours, on average, with a standard deviation of 2.4 hours. Assume that, if all SUVs are rented, customers are willing to wait until there is an SUV available. An SUV is rented, on average, for 3 days, with a standard deviation of 1 day. The company is open 24 hours a day. (Please do not include % sign in your answer)
On average, how many customers are waiting in line for an SUV?