SOLUTION: On a multiple choice test with 24 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the variance for the numb

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Question 323666: On a multiple choice test with 24 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the variance for the number of correct answers.

Answer by stanbon(75887) About Me  (Show Source):
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On a multiple choice test with 24 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the variance for the number of correct answers.
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Binomial with n=24 ; p = 1/4
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variance = npq = 24*(1/4)(3/4) = 9/2
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Cheers,
Stan H.