Just a theory but I'm also 100% sure it's true

https://lemmy.curiana.net/post/450159

I’d say it’s a curve.
This could be log scale. Or inverse log idk which way you want the curve to be
dB is already log scale
meanwhile IQ is not linear or log
True. It’s a Z-score measuring deviation from the mean. A step of one point somewhere on the scale just makes a statement about the relative rareity and not about a set amount of “intelligence” you have more or less than someone else.