$A$ random variable $X$ has the following probability distribution:
$x$ $0$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $P(X=x)$ $k$ $2k$ $3k$ $4k$ $4k$ $3k$ $2k$ $k$ $k$
Then $P(3 < X \leq 6) = $
| $x$ | $0$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ |
|---|---|---|---|---|---|---|---|---|---|
| $P(X=x)$ | $k$ | $2k$ | $3k$ | $4k$ | $4k$ | $3k$ | $2k$ | $k$ | $k$ |
Then $P(3 < X \leq 6) = $
- A$\frac{3}{7}$
- B$\frac{4}{7}$
- C$\frac{13}{21}$
- D$\frac{8}{21}$
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