Answer to B and D please! :)

Problem 18-1 (Algo) Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of 1.1 hours per call. Requests for copier repairs come in at a mean rate of 1.6 per eight-hour day (assume Poisson). Determine the following: a. The average number of customers awaiting repairs. (Round your answer to 2 decimal places.) Answer is complete and correct. Number of customers 0.06 b. System utilization. (Round your answer to 2 decimal places.) Answer is complete but not entirely correct. System utilization 0.22 % % c. The amount of time during an eight-hour day that the repairman is not out on a call. (Round your answer to 2 decimal places.) Answer is complete and correct. Amount of time 6.24 hours d. The probability of two or more customers in the system. (Do not round intermediate calculations. Round your answer to 4 decimal places.) Answer is complete but not entirely correct. Probability 0.0482 X