document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157169>Question 1157169</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 10 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #780007 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=780007\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The estimate between -1 and +1 is 68% (95% for 2 sd s, 99.7% for 3)<BR>\n" );
document.write( "it is 68.27%  </SPAN>\n" );
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