Depends on the genetics of the plant, how long it is vegged, how it is fed, what method (soil/hydro- organics/non-organics) is used.
You can never know ahead of time on each plant-- you CAN get a general idea of the OPTIMAL results from the breeder info...
For example: we Grow Hash Plants and LSD together sometimes. a Hash plant can produce a good 6oz easy when vegged 6 weeks-- but if I veg an LSD the same and grow her the same as I grow the Hash, she will get LESS because- despite being a bigger plant, I will have fed her the same as the Hash plant... but LSD needs more nutes to get good yields... see what I mean?
You need to know the needs of what you are growing and the variables.
You may get what appear to be bigger buds in DWC than from a clone of the same plant in Soil w/organics-- but when dry- they may weigh nearly the same.
too many variables...
best bet: really dial-in your method and look-up the breeder info. They tend to hype the yields to get better sales, so figure at LEAST 1/2 of what they say... better if you are a seasoned grower. (BUT: You aren't- or you wouldn't be asking... so figure about 1/2)
and remember- veg at least 5 weeks after they get their true leaves, use a feeding schedule, and do not over/under water/feed them...
there is a place that lists darned near every seed on the market and has the breeder info... is an alphabetical list & easy to use... may help ya! just look up your strain!
http://en.seedfinder.eu/database/strains/