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Suppose that X1,...,Xn form a random sample of size n from a distribution for which the mean is 6.5 and the variance is 4. Determine

Suppose that X1,...,Xn form a random sample of size n from a distribution for which the mean is 6.5 and the variance is 4. Determine how large the value of n must be in order for the following relation to be satisfied: P(6 Xn 7) 0.8.

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