Question 522704: If you take a 30 question, multiple choice test, where each question has answer choices A, B, C, D,
E, and you randomly guess all of the answers, what is the probability that you will get 20 correct?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! If you take a 30 question, multiple choice test, where each question has answer choices A, B, C, D, E, and you randomly guess all of the answers,
what is the probability that you will get 20 correct?
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Binomial Problem with n = 30 and p = 1/5
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P(x = 20) = 30C20*(1/5)^20*(4/5)^10 = binompdf(30,1/5,20) = 0.0000000338
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Cheers,
Stan H.
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