Question: A machine shop operates two identical machines, supervised by a single operator. Each machine requires a service, independent of the other, at random points in

A machine shop operates two identical machines, supervised by a single operator.
Each machine requires a service, independent of the other, at random points in
time. The probability that one of the machines requires a service in any five minute
period is p =0.4. The operator is able to service one machine in 5 minutes. Let us
approximate the system by dividing the whole period of operation into 5-minute
blocks and assume that any machine failure occurs at the start of a block.

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