Repair calls for UNBC Xerox copiers in Prince George are handled by Barry, that is, one repair person. Repair duration, including travel time, is exponentially distributed with a mean of two hours per call. Requests for copiers come in at a mean rate of three per eight-hour day (assume Poisson). Assume infinite source. Determine: a. The average number of copiers waiting for repair. b. Server utilization. c. The amount of time during an eight-hour day that the repair person is not out on call. d. The probability of two or more copiers in the system (waiting to be or being repaired). e. The probability that a copier waits more than four hours for repair to begin