document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=430324>Question 430324</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You play a game where you are to guess under which of 4 cups a coin has been placed.  How many times would you expect to guess correctly in 20 plays of the game?  Note that the coin is moved after each play.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #298838 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=298838\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  You play a game where you are to guess under which of 4 cups a coin has been placed. How many times would you expect to guess correctly in 20 plays of the game? Note that the coin is moved after each play.\r<BR>\n" );
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document.write( "Binomial Problem with n = 20 and p = 1/4.<BR>\n" );
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document.write( "E(x) = np<BR>\n" );
document.write( "E(x) = 20(1/4)<BR>\n" );
document.write( "E(x) = 5<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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