Question 821851: Please help me with this question, A multiple-choice test consists of 20 questions with possible answers of a, b, c, d. Estimate the probability that with random guessing, the number of correct answers is at least 13.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Please help me with this question, A multiple-choice test consists of 20 questions with possible answers of a, b, c, d. Estimate the probability that with random guessing, the number of correct answers is at least 13.
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Binomial problem with n = 20 and p(correct) = 1/4
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P(13<= x <=20) = 1 - binomcdf(20,1/4,12) = 1.84x10^-4 = 0.000184
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Cheers,
Stan H.
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