Suppose that the amount of time that a certain battery functions is a normal random variable...

Suppose that the amount of time that a certain battery functions is a normal random variable with mean 400 hours and a standard deviation 50 hours. Suppose that an individual owns two such batteries, one of which is to be used as a spare to replace the other when it fails.

(a) What is the probability that the total life of the batteries will exceed 760 hours?

(b) What is the probability that the second battery will outlive the first by at least 25 hours?

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orchestra answered 1 year ago

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