document.write( "Question 870596: The lifetimes 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 this group of bulbs contains those with a lifetime that lies within two standard deviations of the mean on either side? (Hint: Use the “68-95-99.7 Rule”) \n" ); document.write( "

Algebra.Com's Answer #524968 by jim_thompson5910(35256) $\"\"$ $\"About$

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The “68-95-99.7 Rule” or the empirical rule says that approximately 95% of the distribution is within 2 standard deviations. So the answer is roughly 95% \n" ); document.write( "

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