SOLUTION: What are the mean and standard deviation of random answers being correct on a Test with 50 questions and each question having 5 multiple choices?
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Question 916786: What are the mean and standard deviation of random answers being correct on a Test with 50 questions and each question having 5 multiple choices? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! What are the mean and standard deviation of random answers being correct on a Test with 50 questions and each question having 5 multiple choices?
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Binomial Problem::
mean = np = 50(1/5) = 10
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std = sqrt(npq) = sqrt(10(4/5)) = sqrt(8) = 2sqrt(2)
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Cheers,
Stan H.
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