SOLUTION: On a 10 question multiple-choice test, where each question has 5 answers, what would be the probability of getting at least one question corret?

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Hi,

 p(correct)=.2,  q(Incorrect) = .8,   n = 10

P(at least one correct) = 1 - P(none correct) = 1 - binompdf(10, .8, 10).