document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=245679>Question 245679</A>: <I><SPAN STYLE=\"word-break: break-all;\">      A company installs 5,000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How would I Find the approximate number of bulbs that can be expected to last the period of time.Between 500 hours and 675 hours.\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 #179586 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=179586\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A company installs 5,000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. How would I Find the approximate number of bulbs that can be expected to last the period of time.Between 500 hours and 675 hours. <BR>\n" );
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document.write( "Find the z-value for 500 and for 675.<BR>\n" );
document.write( "z(500) = (500-500)/100 = 0<BR>\n" );
document.write( "z(675) = (675-500)/100 = 1.75<BR>\n" );
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document.write( "P(500 < x < 675) = P(0 < z < 1.75) = 0.46<BR>\n" );
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document.write( "The approx. number of bulbs expected to last = 0.46*5000 = 2300<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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