document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=421130>Question 421130</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a multiple-choice test, each question has five options. Students will get 3 points for each correct answer; lose 1 point for each incorrect answer; and receive no points for unanswered questions. A student does not know the correct answer for one question. Is it to her advantage or disadvantage to guess an answer? Show your calculations for expected value.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #294153 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=294153\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It will be a disadvantage to guess:<BR>\n" );
document.write( "The expectation is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2F5%29%2A3+%2B+%284%2F5%29%2A%28-1%29+=+-1%2F5 ALIGN=MIDDLE  ALT=\"%281%2F5%29%2A3+%2B+%284%2F5%29%2A%28-1%29+=+-1%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "Whereas, if he doesn't answer the question, his expectation is 0. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );