3. Let Z,Z1, Z2, . . . be independent and identically distributed random variables satisfying E(Z) =

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3. Let Z,Z1, Z2, . . . be independent and identically distributed random variables satisfying E(Z) = 0 and V (Z) = 1. n Suppose i=1 Zi/

√n has the same distribution as Z for all n.

Prove that Z has a normal distribution.

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