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Mathematics 13 Online
OpenStudy (anonymous):

A student answers a multiple-choice examination question that offers four possible answers. Suppose that the probability that the student knows the answer to the question is 0.8 and the probability that the student will guess is 0.2. Assume that if the student guesses, the probability of selecting the correct answer is 0.25. If the student correctly answers a question, what is the probability that student really knew the correct answer?

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