document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=417639>Question 417639</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A university has 10,000 students of which 6000 are male and 4000 are female.  If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #292380 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=292380\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A university has 10,000 students of which 6000 are male and 4000 are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.<BR>\n" );
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document.write( "Proportion of males = 0.6<BR>\n" );
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document.write( "Mean of males = np = 0.6*6000 = 3600<BR>\n" );
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document.write( "variance of males = sqrt[npq] = sqrt[3600*0.4] = sqrt(1440) = 37.95<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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