document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=795384>Question 795384</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose the distribution of percentage of ideal body weight in a group of women with insulin dependent diabetes mellitus is normal with a mean of 175 lbs and standard deviation of 13.\r<BR>\n" );
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document.write( "My question is: \r<BR>\n" );
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document.write( "What body weight is considered obese (obese is defined as the top 20% of the subjects) and what body weight is considered underweight (defined as in the bottom 10% for body weight)?\r<BR>\n" );
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document.write( "I've tried using the z-score approach with the normal distribution tables however I can't seem to figure it out. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #480948 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=480948\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose the distribution of percentage of ideal body weight in a group of women with insulin dependent diabetes mellitus is normal with a mean of 175 lbs and standard deviation of 13. <BR>\n" );
document.write( "My question is: <BR>\n" );
document.write( "What body weight is considered obese (obese is defined as the top 20% of the subjects) <BR>\n" );
document.write( "Find the z-value with a left tail of 80%::<BR>\n" );
document.write( "invNorm(0.8) = 0.8416<BR>\n" );
document.write( "Find the corresponding weight value::<BR>\n" );
document.write( "x = z*s + u<BR>\n" );
document.write( "x = 0.8416*13+175 = 185.94 lbs.<BR>\n" );
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document.write( "and what body weight is considered underweight (defined as in the bottom 10% for body weight)?<BR>\n" );
document.write( "Find the z-value with left tail of 10%::<BR>\n" );
document.write( "invNorm(0.1) = -1.2816<BR>\n" );
document.write( "x = -1.2816*13+175 = 158.34 lbs<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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