Riley is a technician at a local mobile device repair shop. Repair time is exponentially distributed, with a mean of 2.2 hours per device Customers arrive at the shop in need of repair at a mean rate of 2.3 per eight-hour day tassume Poisson) a. Determine the average number of customers awaiting repairs. (Round your answer to 2 decimal places.) Number of customers b. Determine system utilization (Round your answer to 2 decimal places. Omit the "%" sign in your response) System utilization c. Determine the amount of time during an eight-hour day that Riley is idle (Round your answer to 2 decimal places.) Amount of time hours