Bell curve for ring sizes?

Hi, Can anyone tell me what the average ring sizes are for men and
women, and how far smaller and larger I should make for?


L, M, N seem to be the women’s average ring finger in Australia, but
I sell a lot out side these sizes.

Sold a G to an adult the other day also go to z + 5 for men. Don’t do
many mens rings so don’t have average sizes.