document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=909684>Question 909684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose standard IQ scores are known to be normally distributed with mean of 100 and standard deviation of 15. Find the probability that a randomly selected individual with IQ score between 90 and 120. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #551972 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=551972\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose standard IQ scores are known to be normally distributed with mean of 100 and standard deviation of 15. Find the probability that a randomly selected individual with IQ score between 90 and 120.<BR>\n" );
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document.write( "z(90) = (90-100)/15 = -2/3<BR>\n" );
document.write( "z(120) = (120-100)/15 = 4/3<BR>\n" );
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document.write( "P(90< x <120) = P(-2/3 < z < 4/3) = normalcdf(-2/3,4/3) = 0.6563<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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