document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1052581>Question 1052581</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Compute the standard deviation and variance of two student's quiz grades. Which student has performed more consistently?<BR>\n" );
document.write( "Student A quiz grades: 8,7,5,6,19<BR>\n" );
document.write( "Student B: 2,3,13,5,6 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #667923 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=667923\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The first has a sd of 5.70 (using sample) and variance of 32.49 and the second 4.32, with variance of 18.66.  The second has performed more consistently than the first with less variance.<BR>\n" );
document.write( "The mean of the first is 9<BR>\n" );
document.write( "the squared differences from that 9 are (8-9)^2 or 1, and 4, 16,9, and 100.  That is divided by 4 to get 32.5, and the square root of that is 5.70.  The second is done the same way. </SPAN>\n" );
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