Cheese, what is considered enough cheese on an 11" 12&q

What would be a mean average of cheese in weight that would be considered fair on 11" 12"& 13" pizzas. I know that is Subjective but there must be a considered average.

I am talking mozella Cheese, Shredered.

Would would you put on that size pizza.

Do you place it on the base as well as on top of the pie before it goes in the oven