It's not a 50/50
The female/ male ratio is pretty much 50% but hermies, NATURAL hermies are fairly rare.
Maybe 1 or 2 every 100 seeds - the rest of the hermies will be caused by people not knowing how to grow.
Technically though, remember, a hermie is still a female, with males parts too, but it's more a female than a male. You dont get a male plant with some female flowers.
Bag seeds will have a higher chance of being hermie because the seeds in it probably came from a hermie [or the pollen probably came from a hermie plant] which makes it more inclined to be hermie if it's not female.