Question: Given a normal random variable X with mean 20 and variance 9, and a random sample of size n taken from the distribution, what sample

Given a normal random variable X with mean 20 and variance 9, and a random sample of size n taken from the distribution, what sample size n is necessary in order that P(19.9 ≤ X¯ ≤ 20.1) = 0.95?

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