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A. Extensive experience with fans of a certain type used in diesel engines has suggested that...

A. Extensive experience with fans of a certain type used in diesel engines has suggested that the exponential distribution provides a good model for time until failure. Suppose the mean time until failure is 25,000 hours. What is the probability that fan life is between 16,000 and 24,000 hours?

B. What is the confidence level for the interval ?̅± 1 ⋅ 44 ? √? ?

math   Statistics-And-Probability   
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