document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=360219>Question 360219</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A product has a mean life of 660 hours, and a standard deviation of 45 hours. A business buys 100 such products at random. What is the probability that the mean life of those 100 products would be greater than 650 hours?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #257035 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=257035\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A product has a mean life of 660 hours, and a standard deviation of 45 hours. A business buys 100 such products at random. What is the probability that the mean life of those 100 products would be greater than 650 hours? <BR>\n" );
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document.write( "t(650) = (650-660)/[45/sqrt(100)] = -2.2222<BR>\n" );
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document.write( "P(x-bar > 650) = P(t > -2.2222 when df = 99) = 0.9857<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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