document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=583349>Question 583349</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me find the Probability: A student guesses on every question of a multiple-choice test that has 9 questions, each with 5 possible answers. What is the probability that the student will get at least 7 of the questions right? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #372416 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=372416\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A student guesses on every question of a multiple-choice test that has 9 questions, each with 5 possible answers. What is the probability that the student will get at least 7 of the questions right?<BR>\n" );
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document.write( "Binomial Problem with n = 9 ; p(correct)=1/5 ; p(wrong)=4/5<BR>\n" );
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document.write( "P(7<= x <=9) <BR>\n" );
document.write( "= 1 - P(0<= x <=6) <BR>\n" );
document.write( "= 1 - binomcdf(9,1/5,6) <BR>\n" );
document.write( "= 0.000314<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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