if you grow it right you can pull a half pound, well it depends on what kind of bag you got it from.
USUALLY <------(key word) a bag of mids is an autoflower or a less desirable but high yielding strain, again USUALLY, sometimes its a good strain that was grown shitty or not cured or dried properly.
but if it was good stuff the yield might be lowER (not low, just lowER) but higher potency.
again thats if you are playing by the numbers, sometimes the numbers lie.
i would guess if you put a little effort into it you can get 4 ounces, i think i read somewhere that the average outdoor dry yield is just over half a pound.
smart way to do it is have enough plants so that even if a few die or they all don't yield well you still end up with a decent amount.
i have it planned out so that all i need is 4 ounces off each of my plants to get my goal weight, shouldn't be too hard unless something goes terribly wrong.
but like someone said, the yield will depend on a bunch of stuff.