document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=848131>Question 848131</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 400 families were surveyed. It was found that 90% had a TV set and 60% had a computer. Every family had at least one of these items. One of the families is randomly selected, and it id found that they have a computer. Find the probability that it also has a TV set.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #510894 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=510894\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 400 families were surveyed. It was found that 90% had a TV set and 60% had a computer. Every family had at least one of these items. One of the families is randomly selected, and it id found that they have a computer. Find the probability that it also has a TV set.<BR>\n" );
document.write( "union = # with computer + # with TV - # with both<BR>\n" );
document.write( "400 = 0.9*400 + 0.6*400 - # with both<BR>\n" );
document.write( "400 = 360 + 240 - # with both<BR>\n" );
document.write( "# with both = 200<BR>\n" );
document.write( "P(computer AND TV) = 200/400 = 1/2 <BR>\n" );
document.write( "---------<BR>\n" );
document.write( "P(TV | computer) + P(TV and computer)/P(computer) = 0.5/0.6 = 5/6<BR>\n" );
document.write( "========<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );