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What is the probability that she gets exactly 4 or exactly 5 questions right?
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What is the probability that she gets exactly 4 or exactly 5 questions right?

User Yosbel
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1 Answer

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probability that the questions are answered corectly1/4 = 0.25
probability that they are answered wrong 3/4 = 0.75
probability that 4 out of 7 are corect 7C4(0.25)4(0.75)3 which equals 0.0577
User Tavados
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