3. Let X₁, X, and X, be a random sample of size n=3 from a distribution with p.m.f. Construct a) b) P(X=x)=- ; x = 1, ; x = 2. the probability mass function of X = X₁ + X₂ + X₂ 3 the probability mass function of S² = 1 Σ(X,-X)² 2

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