document.write( "Question 971268: The weights of books on a library shelf are normally distributed with a mean of 3.1 pounds and a standard deviation of 0.8 pound. Approximately what percent of the books weigh more than 3.5 pounds? \n" ); document.write( "
Algebra.Com's Answer #593813 by Boreal(15235)\"\" \"About 
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z=(3.5-3.1)/0.8 ; difference between value and mean divided by standard deviation\r
\n" ); document.write( "\n" ); document.write( "z>0.4/0.8\r
\n" ); document.write( "\n" ); document.write( "z>0.5
\n" ); document.write( "P=0.3085\r
\n" ); document.write( "\n" ); document.write( "30.85% or 31%.\r
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