document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=427247>Question 427247</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. A multiple choice test has 30 questions, and each has five possible answers, of which one is correct.  If a student guesses on every question, find the probability of getting exactly 40% correct.\r<BR>\n" );
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document.write( "I understand n=30 and p=0.20 but the 40% correct is confusing me.  Please help.\r<BR>\n" );
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document.write( "2. What is the probability that 4 rolls of a fair die will show exactly three fours? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #297110 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=297110\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 30*.4=12 questions p=.2, q=.8<BR>\n" );
document.write( "30C12=86493225 combination of 30 things taken 12 at a time.<BR>\n" );
document.write( "86493225*p^12*q^18=.0064<BR>\n" );
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document.write( "Ed\r<BR>\n" );
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