- A function is a PMF if the sum of probabilities for all possible outcomes equals 1, and each probability is non-negative.
- Given probabilities: \( f(-2) = \frac{1}{8}, f(-1) = \frac{2}{8}, f(0) = \frac{2}{8}, f(1) = \frac{2}{8}, f(2) = \frac{1}{8} \).
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