A small town with one hospital has two ambulances to supply ambulance service.Requests for ambulances during non-holiday weekends average 0.8 per hour and tend to be Poisson distributed. Travel and assistance time averages one hour per call and follows an exponential distribution. Find:
(a) System utilization
(b) The average number of customers waiting
(c) The average time customers wait for an ambulance
(d) The probability that both ambulances will be busy when a call comes in.