document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1083140>Question 1083140</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the probability of getting 2 answers correct on an 8 question 5 choice multiple choice exam.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #697135 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=697135\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 8C2 number of ways (which is 28)(1/5)^2(4/5)^6, which are the probabilities of getting it right or wrong.<BR>\n" );
document.write( "8C2=8!/2!6!=8*7/2=28<BR>\n" );
document.write( "probability is 0.2936, if random guessing occurs.<BR>\n" );
document.write( "Expected value is 8*1/5=1.6, so 2 is a likely result for random guessing. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );