Q. a) Illustrate what is the utilization rate of this service system?
(b) Illustrate what is the average downtime for a machine which is broken?
(c) Explain how many machines are waiting to be serviced at any given time?
(d) Illustrate what is the probability which more than one machine is in the system? Probability which more than two are broken and waiting to be repaired or being serviced? More than three? More than four?