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There is 60 multiple choice Q's, 5 possible answers, and only 1 is correct. student makes random guesses for all anws. a. find mean and

There is 60 multiple choice Q's, 5 possible answers, and only 1 is correct. student makes random guesses for all anws.

a. find mean and standard deviation for the # of correct answers for such students.

b. would it be unusual for a student guessing and getting at least 20 correct answers? why please in crude formula used

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