document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1192995>Question 1192995</A>: <I><SPAN STYLE=\"word-break: break-all;\"> On average, a certain laptop lasts for 5 years. The length of time the laptop lasts is exponentially distributed. Find the probability that a laptop would last:<BR>\n" );
document.write( "a) More than 4 years<BR>\n" );
document.write( "b) less than 2 years<BR>\n" );
document.write( "c) between 4 and 6 years. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #825385 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=825385\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> lambda=1/5 for the distribution<BR>\n" );
document.write( "probability x>4 = e^(-4/5)=0.4493<BR>\n" );
document.write( "fewer than two years is 1-e^(-2/5)=0.3297<BR>\n" );
document.write( "more than 6 years is e^-1.2=0.3031 and more than 4 years is 0.4493<BR>\n" );
document.write( "so the difference or 0.1462 is the answer\r<BR>\n" );
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document.write( " </SPAN>\n" );
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