document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1160358>Question 1160358</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that adults have IQ scores that are normally distributed with a mean of 95.5 and a standard deviation 23. Find the first quartile Upper Q 1​, which is the IQ score separating the bottom​ 25% from the top​ 75%.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #783940 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=783940\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> on calculator do VARS 3 invnorm and input .75, 95.5, 23 and get 111.01\r<BR>\n" );
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document.write( "z for the upper quartile, or 75th percentile, is 0.6745<BR>\n" );
document.write( "z=(x-mean)/sd<BR>\n" );
document.write( "0.6745=(x-95.5)/23<BR>\n" );
document.write( "15.51=x-95.5<BR>\n" );
document.write( "x=111.01 </SPAN>\n" );
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