it depends on if you are going to use sog, scrog, prune or grow naturally.
But i would say on average anywhere between 3/4 ounce to 1 1/2 ounces a plant, if they are all female, grown naturally say you get an average of 1 ounce a plant..........thats 50 ounces or close to 3 and a quater pounds.

you could strive for five with some supercropping