| $X = x_{i}$ | $-2$ | $-1$ | $0$ | $1$ | $2$ | $3$ |
| $P(X = x_{i})$ | $0.1$ | $k$ | $0.2$ | $2k$ | $3k$ | $k$ |
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| $X$ | $4k$ | $\frac{30}{7}k$ | $\frac{32}{7}k$ | $\frac{34}{7}k$ | $\frac{36}{7}k$ | $\frac{38}{7}k$ | $\frac{40}{7}k$ | $6k$ |
| $P(X)$ | $\frac{2}{15}$ | $\frac{1}{15}$ | $\frac{2}{15}$ | $\frac{1}{5}$ | $\frac{1}{15}$ | $\frac{2}{15}$ | $\frac{1}{5}$ | $\frac{1}{15}$ |
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