Question 168722: A multiple choice quiz has 20 questions, each question has 4 answers only 1 is correct. if you randomly select one answer for each question find the probability that you will have 12 or more right answers?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A multiple choice quiz has 20 questions, each question has 4 answers only 1 is correct. if you randomly select one answer for each question find the probability that you will have 12 or more right answers?
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P(correct) = 1/4
P(wrong) = 3/4
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n = 20, 12 <= x <= 20
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P(30,1/4,12 <= x <= 20) = 1 - P(0 <= x <= 11) = 1 - 0.9990646 = 0.00093539...
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Cheers,
Stan H.
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