Machines are sent to a repair shop where three mechanics work. The mechanics can repairmachines typically at a rate of 1 every 1.5 days, and the time it takes to repair each machineis exponentially distributed. Suppose 10 machines are sent to the shop (assume there arenone already there). find the following:3(a).  What is the average time it will take to fix them all?3(b).  What is the probability that it will take longer than 1 week to fix all 10 machines?

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