Identify the formula for variance and the given values.

Step 1: Identify the formula for variance and the given values.
The variance of a random variable $X$ is given by the formula:

$$\text{Var}(X) = E(X^2) - (E(X))^2$$

From the image, we can infer the following:
The values of $x$ are: $-3, -2, -1, 0, 1, 2, 3$.
The corresponding probabilities $P(X=x)$ are:
$P(X=-3) = 0.05$
$P(X=-2) = 0.1$
$P(X=-1)