document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1121817>Question 1121817</A>: <I><SPAN STYLE=\"word-break: break-all;\"> show that sum of (xi-a)^2=sum of (xi-x bar)^2+n(x bar -a)^2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #738087 by </B><A HREF=/tutors/aboutme.mpl?userid=Alex.33><B>Alex.33(110)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alex.33><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=Alex.33><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=738087\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x bar=X.\r<BR>\n" );
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document.write( "3.SUM[(xi-a)^2]=SUM[xi^2]+na^2-2a*(SUM[xi])=SUM[xi^2]+na^2-2anX<BR>\n" );
document.write( "1.SUM[(xi-X)^2]=SUM[xi^2]+nX^2-2X*SUM[xi]=SUM[xi^2]+nX^2-2nX^2=SUM[xi^2]-nX^2<BR>\n" );
document.write( "2.n(X-a)^2=nX^2+na^2-2anX.\r<BR>\n" );
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document.write( "1+2=3. Done.\r<BR>\n" );
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