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| rev | Admin | (Created page with "'''Solution: A''' The marginal distribution of X has probability 1/5 + a at 0, 2a + b at 1, and 1/5 + b at 2. Due to symmetry, the mean is 1 and so the variance is (0 − 1)...") | May 9'23 at 9:11 | +383 |