SOLUTION: the lifetime 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

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Question 609896: the lifetime 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?
Answer by ewatrrr(24785) (Show Source):
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Hi, re TY, see higlighted Percentage (Others were for comparison purposes only)
the lifetime 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 life times that lie within 1 standard deviation of the mean on either side?
****one standard deviation from the mean accounts for about % of the set
two standard deviations from the mean account for about 95.4%
and three standard deviations from the mean account for about 99.7%.