document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=693966>Question 693966</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A test consists of 70 multiple choice questions, each with five possible answers, only one of which is correct. find the mean and the 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 #427706 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=427706\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A test consists of 70 multiple choice questions, each with five possible answers, only one of which is correct. find the mean and the standard deviation of the number of correct answers.<BR>\n" );
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document.write( "Binomial distribution with n = 70 and p(correct) = 1/5<BR>\n" );
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document.write( "mean = np = 70(1/5) = 14<BR>\n" );
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document.write( "std = sqrt(npq) = sqrt(14(4/5))= 3.3466<BR>\n" );
document.write( "====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "==================== </SPAN>\n" );
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