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| $X=x$ | $-3$ | $0$ | $1$ | $\alpha$ |
| $P(X=x)$ | $\frac{1}{4}$ | $K$ | $\frac{1}{4}$ | $\frac{1}{3}$ |
| $X$ | $2$ | $3$ | $4$ |
|---|---|---|---|
| $P(X=x)$ | $0.2$ | $0.5$ | $0.3$ |
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