Question: A certain machine breaks down at an average rate of 5 per hour in accordance with a Poisson Process. The cost of a machine hour

A certain machine breaks down at an average rate

A certain machine breaks down at an average rate of 5 per hour in accordance with a Poisson Process. The cost of a machine hour is $15. Two repairmen, A and B, are available to repair the machines. A charges $8 per hour and services the breakdowns at a rate of 7 per hour while B charges $10 per hour and services at a rate of 9 per hour. Which repairman should be hired to repair the machines

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