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?
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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.