Question: A computer lab has three laser printers that are hooked to the network. A working printer will function for an exponential amount of time with

A computer lab has three laser printers that are hooked to the network.

A working printer will function for an exponential amount of time with mean 20 days. Upon failure it is immediately sent to the repair facility. There machines are worked on by two repairman who can each repair one printer in an exponential amount of time with mean 2 days. However, it is not possible for two people to work on one printer at once.

(a) Formulate a Markov chain model for the number of working printers and find the stationary distribution.

(b) How often are both repairmen busy?

(c) What is the average number of machines in use?

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