Question 924700: bill is taking a 10-question multiple choice exam. each question has 5 answers, of which only one is correct. since bill has missed every class, he doesn't know any of the answers and decides to guess on all 10 questions. find the probability that bill will answer at least half of the question correctly.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! bill is taking a 10-question multiple choice exam. each question has 5 answers, of which only one is correct. since bill has missed every class, he doesn't know any of the answers and decides to guess on all 10 questions. find the probability that bill will answer at least half of the question correctly.
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Binomial Problem with n = 10 and p(correct) = 1/5
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P(5<= x <=10) = 1 - binomcdf(10,1/5,4) = 0.0328
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Cheers,
Stan H.
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