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