| $X=x$ | $-3$ | $0$ | $1$ | $\alpha$ |
| $P(X=x)$ | $\frac{1}{4}$ | $K$ | $\frac{1}{4}$ | $\frac{1}{3}$ |
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| $X$ | $1, 2, 3, 4, 5$ |
| $P(X)$ | $K^2, 2K, K, 2K, 5K^2$ |
| $x$ | $-2$ | $-1$ | $3$ | $4$ | $6$ |
| $P(X=x)$ | $\frac{1}{5}$ | $a$ | $\frac{1}{3}$ | $\frac{1}{5}$ | $b$ |
| $X$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ |
| $P(X)$ | $0.15$ | $0.23$ | $0.12$ | $0.10$ | $0.20$ | $0.08$ | $0.07$ | $0.05$ |
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