document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=607889>Question 607889</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this question\r<BR>\n" );
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document.write( "A test consists of 10 true or false questions. If the student guesses on each question: What is the mean number of correct answers? What is 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 #382942 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=382942\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean:\r<BR>\n" );
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document.write( "mu = np = 10*(0.5) = <font color=\"red\">5</font>\r<BR>\n" );
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document.write( "standard deviation:\r<BR>\n" );
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document.write( "sigma = sqrt(np(1-p)) = sqrt(10*(0.5)(1-0.5)) = sqrt(5*0.5) = sqrt(2.5) = <font color=\"red\">1.5811</font> </SPAN>\n" );
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