I need question D please:(

Problem 18-5 (Algo) A small town with one hospital has 3 ambulances to supply ambulance service Requests for ambulances during nonholiday weekends average 060 per hour and tend to be Poisson-distributed, Travel and assistance time averages 2.00 hours per call and follows an exponential distribution Use Toble 18.4. a. Find system utilization (Round your answer to the nearest whole percent.) Answer is complete and correct. Systematization % b. Find the average number of customers walting (Round your answer to 3 decimal places.) Answer is complete and correct. Average number of customers 0.094 c. Find the average time customers wait for an ambulance. (Round your answer to 3 decimal places.) Answer is complete and correct. 0.157 Average time hour 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.) Answer is complete but not entirely correct. Probability 0.30