SOLUTION: The lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of 11 hours. What percentage of the bulbs has lifetimes

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Question 935474: The lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of 11 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side?
Apply the 68-95-99.7 rule to this questions.

A. 68%


B. 1005


C. 99.7%


D. 95%

Answer by oscargut(2103) About Me  (Show Source):
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Answer: D
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