document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1013883>Question 1013883</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a researcher collecting data on college students finds that <BR>\n" );
document.write( "21 have a printer<BR>\n" );
document.write( "56 have a computer and<BR>\n" );
document.write( "12 have both<BR>\n" );
document.write( "a) Why might a student have a printer but not have a computer?<BR>\n" );
document.write( "b) If a student has a computer what is the probability that the student also has<BR>\n" );
document.write( "  a printer<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 #630198 by </B><A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><B>Edwin McCravy(20054)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><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=Edwin+McCravy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=630198\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a researcher collecting data on college students finds that <BR>\n" );
document.write( "21 have a printer<BR>\n" );
document.write( "56 have a computer and<BR>\n" );
document.write( "12 have both\r<BR>\n" );
document.write( "\n" );
document.write( "a) Why might a student have a printer but not have a computer?<BR>\n" );
document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "Because with a printer he/she can scan a page and then print it even \r\n" );
document.write( "if he/she has no computer.\r\n" );
document.write( "</PRE><BR>\n" );
document.write( "b) If a student has a computer what is the probability that the student <BR>\n" );
document.write( "also has a printer.<BR>\n" );
document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "Suppose there are N students at the college.  The conditional probability\r\n" );
document.write( "formula gives this:\r\n" );
document.write( "\r\n" );
document.write( "P(has printer | has computer)  = P(has printer AND has computer)/P(has computer)\r\n" );
document.write( "\r\n" );
document.write( "= (12/N)/(56/N) = (12/N)(N/56) = 12/56 = 3/14\r\n" );
document.write( "\r\n" );
document.write( "Edwn</PRE>\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );