document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=879653>Question 879653</A>: <I><SPAN STYLE=\"word-break: break-all;\"> light bulbs having a mean life of 1260 hours and the standard deviation is 140 hours are used for a consignment of sample of 100 bulbs.<BR>\n" );
document.write( "let x is the life time of a bulb find P(x>=1300) and estimate the number of bulbs.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #531032 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=531032\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Population: mean = 1260, sd = 140, sample of 100<BR>\n" );
document.write( "*Note: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29 ALIGN=MIDDLE  ALT=\"z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "z = 40/(140/sqrt(100)) = 40/14 = 2.8574<BR>\n" );
document.write( "P(x>=1300)= 1 - P(z<1300) = .0021  0r .21%<BR>\n" );
document.write( "E = .0021*100 = .21 bulbs , basically none  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );