document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1122834>Question 1122834</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the mean monthly utility bill for a sample of households in <BR>\n" );
document.write( "a city is $91.79 with a standard deviation of $8.14. find the range of values in which at least 84% of the monthly bills lie. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #739012 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=739012\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The middle 84% are between 8% and 92%<BR>\n" );
document.write( "z values for these are +/- 1.405<BR>\n" );
document.write( "z=(x-mean)/sd<BR>\n" );
document.write( "1.405*8.14=x-91.79<BR>\n" );
document.write( "x-91.79=11.44<BR>\n" );
document.write( "x=$103.23<BR>\n" );
document.write( "and <BR>\n" );
document.write( "x=$80.35<BR>\n" );
document.write( "($80.35, $103.23) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );