document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1192953>Question 1192953</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a firm which conducts consumer surveys by mail has found that 30 percent of those families receiving a questionnaire will return it. in a survey of 10 families, what is the probability that (1) exactly five families will return the questionnaire.(ii) between 3 to 5 five families (inclusive) will return the questionnaire (iii) exactly 10 will return the questionnairo? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #824921 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=824921\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> exactly 10 will return is 0.3^10=0.0000059 or 5.9 x 10^(-6)<BR>\n" );
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document.write( "5 families is 10C5*0.3^5*0.7^5=252*0.3^5*0.7^5=0.1029<BR>\n" );
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document.write( "4 families is 10C4=210*0.3^4*0.7^6=0.2001<BR>\n" );
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document.write( "3 families is 10C3=120*0.3^3*0.7^7=0.2668<BR>\n" );
document.write( "Total of those three is 0.5698.<BR>\n" );
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