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3 May, 12:23

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

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  1. 3 May, 14:26
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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
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