Machinists who work at a tool-and-die plant must check out tools from a tool center. An average of ten machinists per hour arrive seeking tools. At present, the tool center is staffed by a clerk who is paid $25 per hour and who takes an average of 5 minutes to handle each request for tools. Assume that service and interarrival times are exponential. - On average, how many machinists are at the tool center