document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1041450>Question 1041450</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Consider a random experiment in which a coin is tossed three times. Let 'x' be the number<BR>\n" );
document.write( "Of heads. What is the variance of the<BR>\n" );
document.write( "Probability distribution 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 #656415 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=656415\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If it is a fair coin, then the variance is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2A%281%2F2%29%2A%281%2F2%29+=+3%2F4 ALIGN=MIDDLE  ALT=\"3%2A%281%2F2%29%2A%281%2F2%29+=+3%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "If it is not a fair coin, then the variance is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=np%281-p%29+=+3p%281-p%29 ALIGN=MIDDLE  ALT=\"np%281-p%29+=+3p%281-p%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <BR>\n" );
document.write( "where p is the probability of a head turning up in a single toss. </SPAN>\n" );
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