Suppose that the life span of a certain type of fan has an

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Reference no: EM13621327

Suppose that the life span of a certain type of fan has an exponential distribution with a mean life span of 25000 hours. Find the probability thaat a randomly selected fan will last

a. at least 20000 hours

b. between 20000 and 30000 hours

Reference no: EM13621327

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