If $m$ and $\sigma^2$ are the mean and variance of the random variable $X$, whose distribution is given by:

| $x$ | 0 | 1 | 2 | 3 |
|-----|---|---|---|---|
| $P(X=x)$ | $\frac{1}{3}$ | $\frac{1}{2}$ | 0 | $\frac{1}{6}$ |

Then