Question 284766: Willard has just been given a ten-question mulitiple choice test in one of his classes. Each question has five answers only one of which is correct. Since Willard has not attended class recently, he does not know any of the answers. Assume that Willard guesses randomly on all ten questions. Find the probability that he will answer, at most, 3 questions correctly?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Willard has just been given a ten-question mulitiple choice test in one of his classes. Each question has five answers only one of which is correct. Since Willard has not attended class recently, he does not know any of the answers. Assume that Willard guesses randomly on all ten questions. Find the probability that he will answer, at most, 3 questions correctly?
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Binomial Problem with n = 10, p = 1/5
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P(0<= x <=3) = binomcdf(10,1/5,3) = 0.8791..
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Cheers,
Stan H.
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