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.
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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.