The time T required to repair a machine is exponentially distributed with mean 1/2 hours. a) What is the probability that a repair time exceeds half an hour? b) What is the probability that a repair time exceeds 40 minutes? c) What is the probability that a repair time will be between 35 and 45 minutes?

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Q: could you clarify part a please ? is that a g? or a 9? what is part a answer??

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A: Take t value from above given data t = 0.6004 df = 57.7 ~ 58

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Q: Could you give a mathematical explanation for part c please?

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