document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1156208>Question 1156208</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Over the past 10 years, the local school district has measured physical fitness for all high school freshmen. During that time, the average score on a treadmill endurance task has been = 19.8 minutes with a standard deviation of = 7.2 minutes. What proportion of students have a treadmill time less than 30 minutes?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #778888 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=778888\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Over the past 10 years, the local school district has measured physical fitness for all high school freshmen. During that time, the average score on a treadmill endurance task has been = 19.8 minutes with a standard deviation of = 7.2 minutes. What proportion of students have a treadmill time less than 30 minutes?<BR>\n" );
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document.write( "1st::  Find the z-score of 30<BR>\n" );
document.write( "z(30) = (30-19.8)/7.2 = 1.417<BR>\n" );
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document.write( "2nd:: Find the area under the normal curve below z = 1.417<BR>\n" );
document.write( "Ans:: P(z<1.417) = normalcdf(-100,1.417) = 0.92<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stanbon </SPAN>\n" );
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