SOLUTION: a student takes a 8- question, multiple-choice exam with 2 choices for each question and guesses on each question. find the probability of guessing at least 3 out of 8 correctly
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Question 594372: a student takes a 8- question, multiple-choice exam with 2 choices for each question and guesses on each question. find the probability of guessing at least 3 out of 8 correctly Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a student takes a 8- question, multiple-choice exam with 2 choices for each question and guesses on each question. find the probability of guessing at least 3 out of 8 correctly
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Binomial Problem with n = 8 and p(correct) = 1/2
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P(x=3) = 8C3*(1/20^3*(1/2)^5 = 56/2^8 = 0.2188
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Cheers,
Stan H.
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