document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=346633>Question 346633</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student takes a multiple choice test with 10 questions (four answers per question) and guesses at each of the ten. The probability that he gets at least half right? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #247832 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=247832\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Expand the binomial (a+b)^10 Let a=.75 and b=.25<BR>\n" );
document.write( "a^10=.0563 all wrong<BR>\n" );
document.write( "10a^9b=.1877<BR>\n" );
document.write( "45a^8b^2=.2816<BR>\n" );
document.write( "120a^7b^3=.2503<BR>\n" );
document.write( "210a^6b^4=.1460 six wrong<BR>\n" );
document.write( "==========>.9219<BR>\n" );
document.write( ".<BR>\n" );
document.write( "1-.9219=.0781 The probability that he gets at least half right.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );