document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1114478>Question 1114478</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A quiz consists of 60 multiple choice&#8203; questions, each with five possible&#8203; answers, only one of which is correct. If a student guesses on each&#8203; question, what is the mean and standard deviation of the number of correct&#8203; answers? Round to the nearest thousandth. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #729452 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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/cgi-bin/show-face.mpl?user=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=729452\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We use a binomial probability distribution<BR>\n" );
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document.write( "probability of guessing a correct answer is 1/5(0.20) and there are 60 questions<BR>\n" );
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document.write( "mean = 60 * (0.20) = 12<BR>\n" );
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document.write( "standard deviation = square root(60*(0.20)*(1-0.20)) = 3.0984 approximately 3.098<BR>\n" );
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