I'm self-studying this problem, and it seems that have a problem solving this.
The only thing I didn't understand is this solution is how to calculate the average power dissipation. It's never mentioned in class and I can't find any formula even to proceed.
I know that:
$$p_{avg} = \dfrac{V_m \cdot I_m}{2}$$
And I don't see how I can apply this formula to the problem. And I don't think it is helpful anyway since it gives the average power in Watts.
So, how can I calculate the average power dissipation?