document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1139862>Question 1139862</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 569 and a standard deviation of 89.  Use the 68-95-99.7 Rule to find the percentage of people taking the test who score <BR>\n" );
document.write( "between 391 and 747.\r<BR>\n" );
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document.write( "The percentage of people taking the test who score <BR>\n" );
document.write( "between 391 and 747 is __ %? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #760442 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=760442\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd<BR>\n" );
document.write( "so (391-569)/89=-178/89=-2<BR>\n" );
document.write( "and (747-569)/89=178/89=+2<BR>\n" );
document.write( "That is the percentage between -2 and +2 sd, which empirically is 95% </SPAN>\n" );
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