Question: Let Y 1 , Y 2 , . . . , Y n be a random sample from a normal distribution where the mean is

Let Y1, 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 ≤ Y̅≤ 2.1) ≥ 0.99

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