document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=310174>Question 310174</A>: <I><SPAN STYLE=\"word-break: break-all;\"> consider a test with 50 multiple-choice questions, each with 5 options. If students guess radomly on the test, what is the expected mean and standard deviation? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #221834 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=221834\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> consider a test with 50 multiple-choice questions, each with 5 options. If students guess radomly on the test, what is the expected mean and standard deviation?<BR>\n" );
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document.write( "Binomial problem with n = 50 and p = 1/5<BR>\n" );
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document.write( "mean = np = 50*1/5 = 10<BR>\n" );
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document.write( "std = sqrt(npq) = sqrt(10(4/5)) = sqrt(8) = 2sqrt(2)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "stan H. </SPAN>\n" );
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