Question 442573: A quiz consists of 10 multiple-choice questions, each with 5 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A quiz consists of 10 multiple-choice questions, each with 5 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %.
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Need at least 7 correct.
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Binomial Problem with n = 10 and p = 1/5
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To pass need to get at least 7 correct.
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P(7<= x <=10) = 1 - binomcdf(10,1/5,6) = 0.0008644
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Cheers,
Stan H.
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