Westerner
my suggestion is if your going to get into growing different strains and want an accurate answer to your question buy ed rosenthal's book "the big book of buds" it shows yields of indoor and outdoor of over 100 strains. as well as description, what high it gives, other related names, and how long it will take to grow.
but you want an LEGITIMATE answer, so i'll give you an educated answer(not exact) of course there are variables(temp,growing methods, time of year, and plant your growing) if your growing ak-47(sativa) you can expect up to 500g per m2, but this plant does well only in low to medium temps. If you care for it, will probally yield average of 300g. If you grow americano in soil you get only 1 oz per plant, 2 oz in hydro(indica), this is just thrown together example,
hope this helps
Kraze..