document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=952314>Question 952314</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student studying for a vocabulary test knows the meanings of 14 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the words on the test are words that the student knows? (Round your answer to three decimal places.) <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #581592 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=581592\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 14/20=.7, 1-.7=.3<BR>\n" );
document.write( "nCr=10C8=10!/((10-8)!*8!)=45<BR>\n" );
document.write( "45*.7^8*.3^2<BR>\n" );
document.write( "=.233<BR>\n" );
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document.write( "10C9=10<BR>\n" );
document.write( "10*.7^9*.3<BR>\n" );
document.write( "=.121<BR>\n" );
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document.write( ".7^10<BR>\n" );
document.write( "=.028<BR>\n" );
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document.write( ".233+.121+.028<BR>\n" );
document.write( "=.383 (rounding error)  the probability that at least 8 of the words on the test are words that the student knows.<BR>\n" );
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document.write( "Ed<BR>\n" );
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