document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1141293>Question 1141293</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What number of hours lie 2.5 standard deviations above and below the mean? If the distribution is unknown, determine the minimum percentage of lightbulbs with a life within 2.5 standard deviations of the mean\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #761853 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=761853\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The probability in a normal distribution that something is >2.5 sd or <-2.5 sd is 0.0124\r<BR>\n" );
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document.write( "The minimum percentage within 2.5 sd s is 1- 1/(2.5)^2=1-0.16 or 0.84 </SPAN>\n" );
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