Repnir colls are handled by one repaimnan at a photocopy shop. Repair time, inciuding vavel time, is exponentially distributed, with a mean of two hours per coll. Requests for copler repairs come in ot a mean rote of three per eight hour day (ossume Poisson). Determine the following: a. The average number of customers awaiting repsirs. (Round your answer to 2 decimal places.) b. System utization. c. The amount of time during an eight hour day thet the repairman is not out on a call. d. The probability of two or more curtomers in the system. TDo not round interarediete calculations. Round your answer to a decimal ploces)