Mathematics, 14.07.2020 01:01 pettismayersjoy3le8

A repair shop repairs an average of 4.5 machines per hour. Let X be the time (in hours) before the first machine is repaired.(a) What is the probability that a repair time exceeds 4 hours?(b) What is the average time (in hours) it takes to repair the first machine?(c) The conditional probability that a repair takes at least 6 hours, given that it takes more than 4 hours?

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A repair shop repairs an average of 4.5 machines per hour. Let X be the time (in hours) before the f...