A small town with one hospital has 2 ambulances to supply ambulance service. Requests for ambulances during nonholiday w

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A small town with one hospital has 2 ambulances to supply
ambulance service. Requests for ambulances during nonholiday
weekends average 0.50 per hour and tend to be Poisson-distributed.
Travel and assistance time averages 1.50 hours per call and follows
an exponential distribution Use Table 18.4. a. Find system
utilization. (Round your answer to the nearest whole percent.) b.
Find the average number of customers waiting. (Round your answer to
3 decimal places.) c. Find the average time customers wait for an
ambulance. (Round your answer to 3 decimal places.) d. Find the
probability that all ambulances will be busy when a call comes in.
(Round intermediate calculations to 3 decimal places and final
answer to 2 decimal places.)