5. A small town with one hospital has two ambulances to supply ambulance service. Requests for ambulances during nonholiday weekends average .45 per hour and tend to be Poisson-distributed. Travel and assistance time averages two hours 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. 5. A small town with one hospital has two ambulances to supply ambulance service. Requests for ambulances during nonholiday weekends average .45 per hour and tend to be Poisson-distributed. Travel and assistance time averages two hours 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