SOLUTION: A multiple choice exam consists of 25 questions, each with 4 possible answers. What is the probability that they get at least 15 questions correct?

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Hi

questions, each with 4 possible answers: p(c0rrect) = .25

Using TI Calculator

P(x ≥ 15) = 1 – binomcdf(n, p, largest x-value) = 1 - binomcdf(25, .25, 14)