27. (5%) Suppose Xi independently follows a Poisson distribution with mean 3 for i=1~1000. What is the approximate distribution of the sample mean?
(A) Exponential distribution
(B) t-distribution
(C) Gamma distribution
(D) Normal distribution
(E) x2 distribution

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統計： A(0), B(0), C(0), D(2), E(0) #2993386