document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=133641>Question 133641</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780073534961/algebrahomeworkh>Statistics</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I want to see if I did this problem right:<BR>\n" );
document.write( "The average afe of CEO's is 56.  Assume the cariable is normally distrubited.  If the standard deviation is 4 years, find the probability that the age of a randomly selected CEO will be in the following range:<BR>\n" );
document.write( "Between 53 and 59 years old.\r<BR>\n" );
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document.write( "This is how I did it:<BR>\n" );
document.write( "53-56/4 = -.75 then I looked at my chart and found that the average was .2580\r<BR>\n" );
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document.write( "59-56/4 = .75  then I looked at the chart and found the average was .2580 \r<BR>\n" );
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document.write( "then I added the 2 averages together:  .2580 + .2580 = .516 = 51.6% </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #98717 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=98717\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The average afe of CEO's is 56. Assume the cariable is normally distributed. If the standard deviation is 4 years, find the probability that the age of a randomly selected CEO will be in the following range:<BR>\n" );
document.write( "Between 53 and 59 years old. <BR>\n" );
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document.write( "Find the z-score for 53 and for 59:<BR>\n" );
document.write( "z(53) = (53-56)/4 = -0.75<BR>\n" );
document.write( "z(59) = (59-56)/4 = 3/3 = +0.75<BR>\n" );
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document.write( "P(53 < x < 59) = P(-.075 < z < 0.75) = 0.5467<BR>\n" );
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document.write( "Let me know if you do not understand all of this.<BR>\n" );
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document.write( "If you have a TI calculator use normalcdf(53,59,56,4) = 0.5467<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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