document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=926296>Question 926296</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Intelligence quotients on the Stanford binet intelligence test are normally distributed with a mean of 100 and a standard deviation of 16. Use the 68-95-99.7 rule to find the percentage of people with IQs<BR>\n" );
document.write( "a)between 68 and 132<BR>\n" );
document.write( "b)between 68 and 100<BR>\n" );
document.write( "c)above 116<BR>\n" );
document.write( "d)below 68<BR>\n" );
document.write( "e)above 148 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #562145 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=562145\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> For the normal distribution: Below:  z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.  <BR>\n" );
document.write( "Area under the standard normal curve to the left of the particular z is P(z)<BR>\n" );
document.write( "Note: z = 0 (x value: the mean) 50% of the area under the curve is to the left and 50%  to the right<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=drawing%28400%2C200%2C-5%2C5%2C-.5%2C1.5%2C+graph%28400%2C200%2C-5%2C5%2C-.5%2C1.5%2C+exp%28-x%5E2%2F2%29%29%2C+green%28line%281%2C0%2C1%2Cexp%28-1%5E2%2F2%29%29%2Cline%28-1%2C0%2C-1%2Cexp%28-1%5E2%2F2%29%29%29%2Cgreen%28line%282%2C0%2C2%2Cexp%28-2%5E2%2F2%29%29%2Cline%28-2%2C0%2C-2%2Cexp%28-2%5E2%2F2%29%29%29%2Cgreen%28line%283%2C0%2C3%2Cexp%28-3%5E2%2F2%29%29%2Cline%28-3%2C0%2C-3%2Cexp%28-3%5E2%2F2%29%29%29%2Cgreen%28line%28+0%2C0%2C+0%2Cexp%280%5E2%2F2%29%29%29%2Clocate%284.8%2C-.01%2Cz%29%2Clocate%284.8%2C.2%2Cz%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "......<BR>\n" );
document.write( "one  standard deviation from the mean accounts for about 68% of the set <BR>\n" );
document.write( "two standard deviations from the mean account for about 95%<BR>\n" );
document.write( "and three standard deviations from the mean account for about 99.7%.<BR>\n" );
document.write( ".......<BR>\n" );
document.write( "mean of 100 and a standard deviation of 16\r<BR>\n" );
document.write( "\n" );
document.write( "a)between 68 and 132: (2SDs on either side of mean) 95%<BR>\n" );
document.write( " b)between 68(-2SDs) and 100:  50% - 95%/2 <BR>\n" );
document.write( " c)above 116 (1SD):  50% +   68%/2<BR>\n" );
document.write( " d)below 68(-2SDs):  (100%-95%)/2<BR>\n" );
document.write( " e)above 148 (3Sds):   (100%-99.7%)/2 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );