document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1040205>Question 1040205</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The mean value of land and buildings per acre from a sample of farms is <BR>\n" );
document.write( "&#8203;$1200 with a standard deviation of &#8203;$200. The data set has a&#8203; bell-shaped distribution. Assume the number of farms in the sample is 7878.\r<BR>\n" );
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document.write( "Use the empirical rule to estimate the number of farms whose land and building values per acre are between $1000 and $1400.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #655881 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=655881\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> By the empirical rule, approximately 68% of all farms have land and building values per acre that are between $1000 and $1400, <BR>\n" );
document.write( "because these two values are within 1 standard deviation of the mean $1200. \r<BR>\n" );
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document.write( "That means around 0.68*7,878 = 5,357 (rounded to the nearest whole number) farms have land and building values per acre between $1000 and $1400. </SPAN>\n" );
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