document.write( "Question 1206716: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 60 and a standard deviation of 5. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 55 and 70?\r
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Algebra.Com's Answer #844314 by ikleyn(52862) $\"\"$ $\"About$

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document.write( "55 is one standard deviation down from the mean of 60,\r\n" );
document.write( "while 70 is two standard deviations up from the mean of 60.\r\n" );
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document.write( "So, based on standard rule, the  ANSWER  is   +  = 81.5%.\r\n" );
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