SOLUTION: a student takes a 20 question multiple choice exam with 5 choices for each question and guesses on each question. find the probability of guessing at least 15 out of the 20 correc
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Question 238363: a student takes a 20 question multiple choice exam with 5 choices for each question and guesses on each question. find the probability of guessing at least 15 out of the 20 correctly. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a student takes a 20 question multiple choice exam with 5 choices for each question and guesses on each question. find the probability of guessing at least 15 out of the 20 correctly.
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It is a binomial problem with n=20, p=1/5 ; 15<= x <=20
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Prob = 1 - binomcdf(20,1/5,14) = 0.0000001803
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Cheers,
Stan H.
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