document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=810265>Question 810265</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The lifetime of light bulbs that are advertised to last for 6200 hours are normally distributed with a mean of 6500 hours and a standard deviation of 150 hours. What is the probability that a bulb lasts longer than the advertised figure?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #488303 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=488303\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The lifetime of light bulbs that are advertised to last for 6200 hours are normally distributed with a mean of 6500 hours and a standard deviation of 150 hours. What is the probability that a bulb lasts longer than the advertised figure? <BR>\n" );
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document.write( "z(6200) = (6200-6500)/150 = -2<BR>\n" );
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document.write( "P(x > 6200) = P(z > -2) = normalcdf(-2,100) = 0.9772<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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