document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=87652>Question 87652</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For a throw of a fair tetrahedral die with its faces marked 1,2,3,4 respectively, the score X represents the number of the face which lands on the floor. Find the mean and the variance of X. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #63621 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=63621\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> For a throw of a fair tetrahedral die with its faces marked 1,2,3,4 respectively, the score X represents the number of the face which lands on the floor. Find the mean and the variance of X.<BR>\n" );
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document.write( "Values of the random variable: 1,2,3,4<BR>\n" );
document.write( "Probability of each value is 1/4<BR>\n" );
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document.write( "Mean = (1/4)(1+2+3+4)= 5/2 = 2.5<BR>\n" );
document.write( "Variance = 1.118^2 = 1.249924...<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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