document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1160261>Question 1160261</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An exciting computer game is released. Some of the players who complete all the levels will buy an advanced version of the game. Suppose that 25% of the players buy an advanced version. In a group of 15 players,  \r<BR>\n" );
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document.write( "i. what is the expected number of people who will buy the advanced version?[Ans. 3.75]  \r<BR>\n" );
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document.write( "ii. What is the probability that at least two people will buy it?[Ans. 0.237]  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #783535 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=783535\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean is np, n=15 p=0.375 product is 3.75\r<BR>\n" );
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document.write( "what is probability 13 or 14 or 15 will not buy it with probability of 0.75 individually of not buying it.<BR>\n" );
document.write( "for 15 it is 0.75^15=0.0134<BR>\n" );
document.write( "for 14 it is 15* .75^14*0.25=0.0668<BR>\n" );
document.write( "for 13 it is 15C2*0.75^13*0.25^2=0.1559<BR>\n" );
document.write( "sum=0.23706 or 0.237<BR>\n" );
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