document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=25143>Question 25143</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A university test was given where the scores are normally distributed.  A student had a score of 61% which was 2.45 standard deviations from the mean.  If the mean of the exam scores was 54%, then what was the standard deviation of the exam scores?\r<BR>\n" );
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document.write( "And I would like to say thank you to everybody who answered all my problems in the past and to the person who solves this question. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #20889 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=20889\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use  the \"z\" formula:<BR>\n" );
document.write( "   z(x)=(x-mu)/sigma<BR>\n" );
document.write( "  2.45 = (0.61-0.54)/sigma<BR>\n" );
document.write( "  sigma = (0.07)/2.45 = 0.02857...<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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