Question 731180
A person randomly selects answers to all 10 questions on a multiple-choice quiz. Each question has 1 correct answer and 3 incorrect answers. 
Find the probability that at least 8 answers are correct. 
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P(correct) = 1/3
P(8<= x <=10) = 1 - P(0<= x <=7) = 1 - binomcdf(10,1/3,7) = 0.0034
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Cheers,
Stan H.
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