Question: can you explain this? . P(X = -1) = 0.2 . P(X = 0) = 0.7 - 0.2 = 0.5 P(X = 1) = 1

can you explain this?

. P(X = -1) = 0.2 . P(X = 0) = 0.7 - 0.2 = 0.5 P(X = 1) = 1 - 0.7 = 0.3

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