document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=578768>Question 578768</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A four-question multiple choice quiz with choices A, B, C, D, and E. If a person taking the quiz guessed all four questions, find:\r<BR>\n" );
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document.write( "P( exactly two correct) </SPAN>\n" );
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document.write( "5 choices, therefore P(correct) for any independent question is 1/5:\r<BR>\n" );
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document.write( "P(exactly 2 correct) = P(2 correct)x P(2 wrong)\r<BR>\n" );
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document.write( "= (1/5)(1/5) x (4/5)(4/5)\r<BR>\n" );
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document.write( "= .04 x .64 = .0256 = roughly 2.6% chance\r<BR>\n" );
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document.write( "There is a 4 % chance that he/she gets at least 2 correct, so the probability for getting two and ONLY two correct, should be lower, since less outcomes satisfy the conditions.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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