The average of three numbers $x_1$, $x_2$ and $x_3$ is computed as

$$\frac{x_1+x_2+x_3}{3}$$

Assignment

The code snippet below assigns three values to three variables:var1, var2 and var3. Your task:

1. Compute the average of these values and assign it to the variable average.

2. Print the average.

3. Add three comments.