document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1102738>Question 1102738</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a research organization decides to mail 9 questionnaires to people selected at random. if the probability of anyone answering the questionnaire is 1/7 find the probability that exactly 5 will answer the questionnaire </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #717508 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=717508\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It is 9C5(1/7)^5(6/7)^4, the 9C5 being the number of ways 5 people out of 9 can answer.<BR>\n" );
document.write( "126*(1/7)^5(6/7)^4<BR>\n" );
document.write( "126*1296/7^9=126*1296/40353607=0.0040. ANSWER<BR>\n" );
document.write( "The expected value is 9/7, so it is very unlikely. </SPAN>\n" );
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