document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=873009>Question 873009</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Show all work. Just the answer, without supporting work, will receive no credit. <BR>\n" );
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document.write( "The heights of pecan trees are normally distributed with a mean of 10 feet and a standard deviation of 2 <BR>\n" );
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document.write( "1. What is the probability that a randomly selected pecan is between 8 and 12 feet tall?\r<BR>\n" );
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document.write( "2. Find the 80th percentile of the pecan tree height distribution. \r<BR>\n" );
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document.write( "3. If a random sample of 64 pecan trees is selected, what is the standard deviation of the sample mean? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #526596 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=526596\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean of 10 feet and a standard deviation of 2<BR>\n" );
document.write( "1. P (8 > x < 12) = P(z &#8804; 2/2) - P(z &#8804; -2/2 ) =  .8413 - .1587<BR>\n" );
document.write( "2 z = invNorm(.80)= .8416 = (X-10)/2, 2(.8416) + 10 = X<BR>\n" );
document.write( "3. s = 2/Sqrt(64) = .25 </SPAN>\n" );
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