Probability of selecting the correct answer


A student answers a multiple choice test question that offers four answers. The probability that the student knows the answer is .80 and the probability that the student will guess is .20. Assume that if the student guesses, the probability of selecting the correct answer is .25. If the student correctly answers a question, what is the probability that the student really knew the correct answer?

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Basic Statistics: Probability of selecting the correct answer
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