Example of random variable, Econometrics

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Let W be a random variable such that Supp (W) = {2, -1, 0, 1, 2 } and

What is p? Define U = W². What is Supp (U) and fU (u) = Pr [U = u] for u ∈ Supp (U)? Compute E [W] and E [U].

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