depends on how there planted.....
straight up dude. this is the way it goes. i have 69 Auroa Indica and 50 Atomic NL planted in 2 raised beds, spaced at about 1 plant/Sq foot..... im expecting 25-35(agv. 30) Grams/plant because of our slow growing season and the way they are planted..... so 119x30=3570 Grams of marijuana. theres 454 Grams in a Pound so 3570/454=7.8. im expecting to get 7 to 8 LBS of weed, from 119 plants. except they have to be sexed so lets add that in there, lets say there 30% males (hoping for the best...) that means im going to get roughtly 5 LBS or marijauan from my 119 plants.
hope that helped
i throw down 100+ plants every year. the largest grow i have personaly done is 1200 Plants on an outdoor drip system. i know a guy who does 4500 plants on a drip system, yearly. you should come to canada.... the second largest land mass on the planet with a population on 40 million people, you can literally goto the bush and not see people for 2-3 months some times. and it would cost the police a few million $$ to helicopter everything in to bust you. makes life easy