document.write( "Question 580957: At one high school, the mean time for running the 100-yard dash is 15.2 seconds with a standard deviation of 0.9 seconds. The time are very closely approximated by a normal curve. Find the percent of times that are:\r
\n" ); document.write( "\n" ); document.write( "More than 15.2 seconds\r
\n" ); document.write( "\n" ); document.write( "Between 14.3 and 16.1 seconds\r
\n" ); document.write( "\n" ); document.write( "Thank you. \n" ); document.write( "
Algebra.Com's Answer #371456 by stanbon(75887)\"\" \"About 
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At one high school, the mean time for running the 100-yard dash is 15.2 seconds with a standard deviation of 0.9 seconds. The time are very closely approximated by a normal curve. Find the percent of times that are:
\n" ); document.write( "More than 15.2 seconds
\n" ); document.write( "z(15.2) = (15.2-15.2)/0.9 = 0
\n" ); document.write( "P(z > 15.2) = 0.50 = 50%
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\n" ); document.write( "Between 14.3 and 16.1 seconds
\n" ); document.write( "z(14.3) = (14.3-15.2)/0.9 = -1
\n" ); document.write( "z(16.1) = (16.1-15.2)/0.9 = 1
\n" ); document.write( "--------------------------------
\n" ); document.write( "P(14.3 < x < 16.1) = P(-1< z < 1) = 0.6827
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\n" ); document.write( "cheers,
\n" ); document.write( "Stan H.
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