document.write( "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? \n" ); document.write( "

Algebra.Com's Answer #384015 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi, re TY, see higlighted Percentage (Others were for comparison purposes only)
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document.write( "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. 
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document.write( "What percentage of bulbs has life times that lie within 1 standard deviation of the mean on either side? 
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document.write( "****one  standard deviation from the mean accounts for about % of the set \r
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document.write( "two standard deviations from the mean account for about 95.4%
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document.write( "and three standard deviations from the mean account for about 99.7%.
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