A small town with one hospital has 3 ambulances to supply ambulance service. Requests for ambulances during nonholiday weekends average .40 per hour and tend to be Poisson-distributed. Travel and assistance time averages 2 hours per call and follows an exponential distribution Use Table 1.
a. Find system utilization. (Round your answer to the nearest whole percent. Omit the "%" sign in your response.)
System utilization______%
b. Find the average number of customers waiting. (Round your answer to 3 decimal places.)
Average number of customers______
c. Find the average time customers wait for an ambulance. (Round your answer to 3 decimal places.)
d. Find the probability that both ambulances will be busy when a call comes in. (Round intermediate calculations to 3 decimal places and final answer to 2 decimal places.)