document.write( "Question 1043272: The distribution of cholesterol level in teenage boys is approximately normal with a mean of 170 and a standard deviation of 30. Levels above 200 warrant attention. What percent of teenage boys have levels between 170 and 225?\r
\n" ); document.write( "\n" ); document.write( "options were :56.13%, 3.36%, 6.06% and 46.64%
\n" ); document.write( "I picked 46.64% but I got it wrong. I don't get it. \n" ); document.write( "
Algebra.Com's Answer #658394 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
The distribution of cholesterol level in teenage boys is approximately normal with a mean of 170 and a standard deviation of 30. Levels above 200 warrant attention. What percent of teenage boys have levels between 170 and 225?
\n" ); document.write( "options were :56.13%, 3.36%, 6.06% and 46.64%
\n" ); document.write( "----
\n" ); document.write( "z(170) = (170-170)/30 = 0
\n" ); document.write( "z(225) = (225-170)/30 = 55/30 = 1.83333
\n" ); document.write( "--------
\n" ); document.write( "P(170< x < 225) = P(0< z < 5/3) = normalcdf(0,1.8333) = 46.64%
\n" ); document.write( "-------------------
\n" ); document.write( "Comment:: Actually I got an answer of 46.67% when rounded up
\n" ); document.write( "But maybe you are supposed to use a chart that gives you an answer of 46.64%
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "---------------------- \n" ); document.write( "
\n" );