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12* (extra credit). Discrete random variable X takes three values: -1, 0 or 1. Its mathematical expectation is 0, and its variance is 0.4. Find

12* (extra credit). Discrete random variable X takes three values: -1, 0 or 1. Its mathematical expectation is 0, and its variance is 0.4. Find P(X = 0) .|

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