The mean and standard deviation of the lifetime of a

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The mean and standard deviation of the lifetime of a battery in a portable computer are 3.5 and 1.0 hours, respectively.

(a) Approximate the probability that the mean lifetime of 25 batteries exceeds 3.25 hours.

(b) Approximate the probability that the mean lifetime of 100 batteries exceeds 3.25 hours.

Reference no: EM13604591

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