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A test consists of 60 multiple choice questions, each with four possible answers, only one of which is correct. A student randomly guesses at all

A test consists of 60 multiple choice questions, each with four possible answers, only one of which is correct. A student randomly guesses at all 60 questions. a) Find the mean and the standard deviation of the number of correct answers. b) Use the mean and standard deviation to determine how many questions correct we could usually (2 standard deviations) expect from a student who randomly guesses at all 60 questions.

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