Question 677849
40 multiple choice questions, 4 possible answers for each question, only one correct answer, if random guesses for all questions, what is the mean and standard deviation for number of correct answers?
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mean = np = 40*(1/4) = 10
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std = sqrt(npq) = sqrt(10*(3/4) = sqrt(7.5) = 2.7386

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cheers,
Stan H.