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On a multiple choice test with 40 questions each question

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On a multiple choice test with 40 questions, each question has four possible answers, and each question has one correct answer. 3a) For students who guess at all answers, find the mean and standard deviation for the number of correct answers they would get. 3b) Would it be unusual for a student to get at least half of the answers correct by genuinely guessing on every question? Show why

Reference no: EM13636164

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