Q. "Debra Bishop's cabinet-making shape, in Des Moines, has five tools which automate the drilling of holes for the installation of hinges. These machines need setting up for each order of cabinets. The orders appear to follow the Poisson distribution, averaging 3 per 8-hour day. There is a single technician for setting these machines. Her service times are exponential, averaging 2 hours each. a) Illustrate what is the service factor for this system? b) Illustrate what is the average number of these machines in service? c) Illustrate what impact on machines in service would there be if a second technician were available?"