Question 1111711: A chimp is taking a multiple-choice test. Of course, the chimp can't read and is guessing for every question. If there are 4 choices for each question, and there are 84 questions on the test, How many questions can we expect the chimp to answer correctly? ( there is 25% chance that the chimp will guess correctly)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A chimp is taking a multiple-choice test. Of course, the chimp can't read and is guessing for every question. If there are 4 choices for each question, and there are 84 questions on the test, How many questions can we expect the chimp to answer correctly? ( there is 25% chance that the chimp will guess correctly)
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Binomial Problem with n = 84 and p = 0.25
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mean = np = 84(1/4) = 21
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Cheers,
Stan H.
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