Question 959364: A multiple choice test has 30 questions, and each has four possible answers, of which one is correct. If a student guesses on every question, find the probability of getting exactly 9 correct.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A multiple choice test has 30 questions, and each has four possible answers, of which one is correct. If a student guesses on every question, find the probability of getting exactly 9 correct.
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Binomial Problem with n = 30 and p(correct) = 1/4
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P(x = 9) = 30C9(1/4)^9*(3/4)^21 = binompdf(30,1/4,9) = 0.1298
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Cheers,
Stan H.
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