Question: 7.23 A facility has four machines, with two repair workers to maintain them. Individual machines fail on average every 10 hours. It takes an individual

7.23 A facility has four machines, with two repair workers to maintain them. Individual machines fail on average every 10 hours. It takes an individual repair worker on average 4 hours to ix a machine. Repair and failure times are independent and exponentially distributed.

(a) Find the generator matrix.

(b) In the long term, how many machines are typically operational?

machines are working after 5 hours.

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