A pizza place is considering opening a drive-through window for customer pickups. It is estimated that at peak times (6-9pm and 1-3am), customers will arrive at a rate of 11 per hour. The clerk who will staff the window can serve customers at the rate of one every three minutes. For the peak times, what is the:
a. Average number of customers in the waiting line (in the queue)?
b. Average customer waiting time in line (in minutes)?
c. Probability that more than two customers will be in the system at one time?