document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=323666>Question 323666</A>: <I><SPAN STYLE=\"word-break: break-all;\"> On a multiple choice test with 24 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the variance for the number of correct answers.\r<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 #231629 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=231629\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> On a multiple choice test with 24 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the variance for the number of correct answers.<BR>\n" );
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document.write( "Binomial with n=24 ; p = 1/4<BR>\n" );
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document.write( "variance = npq = 24*(1/4)(3/4) = 9/2<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
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