Question: LetY1,Y2,...,Yn be a random sample from a normal distribution where the mean is 2 and the variance is 4. How large must n be in

LetY1,Y2,...,Yn be a random sample from a normal distribution where the mean is 2 and the variance is 4. How large must n be in order that P(1.9 Y 2.1) 0.99

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