Question: The time between failures of a laser in a cytogenesis machine is exponentially distributed with a mean of 25,000 hours. (a) What is the expected

The time between failures of a laser in a cytogenesis machine is exponentially distributed with a mean of 25,000 hours.
(a) What is the expected time until the second failure?
(b) What is the probability that the time until the third failure exceeds 50,000 hours?

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