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If X1, X2, . .., X10 are i.i.d. Nor(2, 10) , then what is the distribution of the sample mean X ? O (a) Nor

If X1, X2, . .., X10 are i.i.d. Nor(2, 10) , then what is the distribution of the sample mean X ? O (a) Nor (2, 0) O (b) Nor(2, 1) O (c) Nor(2, 10) O (d) Nor(20, 1) O (e) Nor(20, 10)

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