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    Probability from Z score

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    The lifetime of a super tough AAA battery is normally distributed wit mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be? Use given data, requirement and sketch of normal curve labled to solve;

    a) 25 hours or less

    b) 34 hours or more

    c) between 25 and 34 hours

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    https://brainmass.com/statistics/z-test/probability-z-score-305095

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    Solution Summary

    This solution gives the step by step method for computing probabilities based on Z score.

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