document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=476769>Question 476769</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The mean score on a history test was 74.3 and the standard deviation was 5.7. Assuming the scores are normally distributed,what fraction of scores are above 80? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #326904 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=326904\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The mean score on a history test was 74.3 and the standard deviation was 5.7. Assuming the scores are normally distributed,what fraction of scores are above 80?<BR>\n" );
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document.write( "z(80) = (80-74.3)/5.7 = 1<BR>\n" );
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document.write( "P(x > 80) = P(z > 1) = normalcdf(1,100) = 0.1587<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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