Benny's Arcade has four video game machines. The average time between machine failures is 50 hours. Jimmy, the maintenance engineer, can repair a machine in 20 hours on average. The machines have an exponential failure distribution, and Jimmy has an exponential service-time distribution.
a.Jimmy's utilization is?
b. What is the average number of machines out of? service, that? is, waiting to be repaired or being? repaired?
c. What is the average time a machine is out of? service?