document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149493>Question 149493</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a shop there are 20 customers, 18 of whom will make a purchase. If three customers are selected, one at a time, at random, what is the probability that all will make a purchase? Is it 0.7717, 0.7605, 0.8524, or 0.8808.\r<BR>\n" );
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document.write( "Please help  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109677 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=109677\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In a shop there are 20 customers, 18 of whom will make a purchase.<BR>\n" );
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document.write( "P(a random person in the group makes a purchase) = 18/20 = 9/10<BR>\n" );
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document.write( "If three customers are selected, one at a time, at random, what is the probability that all will make a purchase?<BR>\n" );
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document.write( "This is a binomial problem with p=0.9 <BR>\n" );
document.write( "P(3 of 3 make a purchase) = 0.9^3 = 0.729<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( " Is it 0.7717, 0.7605, 0.8524, or 0.8808. <BR>\n" );
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