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What percentage of the bulbs have lifetimes

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Reference no: EM132386677

Apply the? 68-95-99.7 rule to answer the question.

The lifetimes of light bulbs of a particular type are normally distributed with a mean of 240 hours and a standard deviation of 8 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of the? mean?

Reference no: EM132386677

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