document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=133741>Question 133741</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am not even sure where to start with this problem. Any assistance would be helpful. Thank you! \r<BR>\n" );
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document.write( "A survey of 12 people at a bookstore showed that five had purchased a hardcover book. If seven people are selected at random, what is the probability that four of them had purchased a hardcover book? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #98714 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=98714\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A survey of 12 people at a bookstore showed that five had purchased a hardcover book. If seven people are selected at random, what is the probability that four of them had purchased a hardcover book?<BR>\n" );
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document.write( "From the survey you have P(person buys a hardcover book) = 5/12<BR>\n" );
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document.write( "In a random sample of 7 you have a binomial problem with p = 5/12<BR>\n" );
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document.write( "P(4 buy out of 7) = 7C4(5/12)^4(7/12)^3 = 0.2094<BR>\n" );
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document.write( "If you have a TI calculator that is binompdf(7,(5/12),4)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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