document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=821846>Question 821846</A>: <I><SPAN STYLE=\"word-break: break-all;\"> John is taking an exam, but hasn’t studied or gone to class all term. He figures on guessing all the answers and hoping to get lucky. The test contains 100 multiple-choice questions. Each question has 5 possible answers, only one of which is the correct answer.  \r<BR>\n" );
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document.write( "What are John’s chances of scoring:\r<BR>\n" );
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document.write( "a.	exactly 70 on the exam?\r<BR>\n" );
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document.write( "b.	70 or better on the exam?\r<BR>\n" );
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document.write( "c.	90 or better on the exam?<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 #494462 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=494462\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The test contains 100 multiple-choice questions. Each question has 5 possible answers, only one of which is the correct answer.<BR>\n" );
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document.write( "Binomial with n = 100 and p(correct) = 1/5 <BR>\n" );
document.write( "What are John’s chances of scoring: <BR>\n" );
document.write( "a. exactly 70 on the exam?<BR>\n" );
document.write( "P(x = 70) = 100C70(1/5)^70*(4/5)^30 = binompdf(100,1/5,70) = 4.29x10^-27<BR>\n" );
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document.write( "b. 70 or better on the exam?<BR>\n" );
document.write( "P(70<= x <=100) = 1 - binomcdf(100,1/5,69) = 0 to 9 decimal places<BR>\n" );
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document.write( "c. 90 or better on the exam?<BR>\n" );
document.write( "P(90<= x <=100) = 1 - binomcdf(100,1/5,89) = 0 to 9 decimal places<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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