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typical student has a normal distribution with mean of 10 minutes and standard deviation of 2...

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Statistics

typical student has a normal distribution with mean of 10minutes and standard deviation of 2 minutes to complete a question.The total exam has 80 minutes.

how many questions should the exam have so that only 6 in 10,000students failed the exam?

(that is, p(y>80) = 0.0005)

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