Depends on the strain, the condition of the grow and the species of it. Like for instance it could be estimated that you get 500 g's from one plant under certain conditions and the estimate might have been made under the best conditions but say it was made from a harvest that was grown under a 600w light and you grow with a 250w light, the yield will change drastically. So theres alot of things that go with the yield of one plant so a question like you asked cant really be answered.