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2 June, 12:58

The lifetimes of light bulbs of a particular type are normally distributed with a mean of 210 hours 14) and a standard deviation of 5 hours. what percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean

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  1. 2 June, 13:21
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    68% of data lies within one standard deviation of the mean of a Normal Distribution no matter what the mean and standard deviation are.
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