| $x$ | $0$ | $1$ | $2$ | $3$ |
| $P(x)$ | $0.2$ | $k$ | $k$ | $2k$ |
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| $X$ | $0$ | $2$ | $4$ | $6$ | $8$ |
| $P(X)$ | $a$ | $2a$ | $a+b$ | $2b$ | $3b$ |
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