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week5 - Construct a 90 CI for µ the mean susceptibility...

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1 Statistics 511 (4.13) Normal Approximation to the Binomial To improve approximation: Ex. In a large university, 25% of the students are over 21 years old. In a sample of 400 students, what is the probability that more than 110 of them are over 21 years old?
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