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    Mean and Standard Deviation of Light Bulb Lifetime

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    The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?

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    https://brainmass.com/statistics/dispersion-and-spread-of-data/mean-standard-deviation-light-bulb-lifetime-463719

    Solution Summary

    The solution determines what percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side.

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