document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=867511>Question 867511</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a test consists of 80 multiple choice questions each with five possible answers. Find mean and standard deviation of the number of correct answers </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #523052 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=523052\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a test consists of 80 multiple choice questions each with five possible answers.<BR>\n" );
document.write( "n = 80 ; p(correct) = 1/5<BR>\n" );
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document.write( "Find mean and standard deviation of the number of correct answers<BR>\n" );
document.write( "mean = n*p = (1/5)80 = 16<BR>\n" );
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document.write( "std = sqrt[npq] = sqrt[16*(4/5)] = 8/sqrt(5)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=================<BR>\n" );
document.write( " </SPAN>\n" );
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