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    Probability based on Z score

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    I need easy step by step instructions of how to do the following word problem.
    A) A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.

    B) If you purchased a battery and it lasted only 23 months, would the life of your battery be considered an outlier?

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    https://brainmass.com/statistics/z-test/probability-based-z-score-390661

    Solution Preview

    Business Stat I Practice Problem
    A. I need easy step by step instructions of how to do the following word problem.
    A battery manufacturer advertises the average life of its automobile battery is 60 ...

    Solution Summary

    Step by step method for computing probability based on Z score is given in the answer.

    $2.19

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