Let X be a random variable with discrete pdf f(x) = x/8 if x = 1, 2, 5, and zero otherwise. Find: E(X), Var(X), E(2X + 3).
Added by Tara H.
Step 1
Given x can be 1, 2, or 5 with f(x) = x/8, we have: f(1) = 1/8 f(2) = 2/8 = 1/4 f(5) = 5/8 Check that the probabilities sum to 1: (1/8) + (2/8) + (5/8) = 8/8 = 1 Show more…
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