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    % of batteries that has life span that is more than 2065 hr

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    The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 30 hours. What percent of batteries have a life span that is more than 2065 hours?

    1. 3%
    2. 2.6%
    3. 1%
    4. 1.5%

    © BrainMass Inc. brainmass.com June 3, 2020, 10:47 pm ad1c9bdddf
    https://brainmass.com/statistics/descriptive-statistics/of-batteries-that-has-life-span-that-is-more-than-2065-hr-250162

    Solution Preview

    Using the z formula:

    z = (x-mean)/standard deviation

    Given mean= ...

    Solution Summary

    A step by step solution to the problem is provided.

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