On normal rolls, the long-term, average should be 10.5.
With advantage, it should be ~13.9.
Without, ~7.1
https://www.r-bloggers.com/2020/06/dungeons-and-dragons-advantage/One time when rolling 100, I had an average of normal rolls of over 11, however that should even out.
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=709062#Post709062If anybody's interested and records stuff, you could also post your findings in that thread (there's now over 2,000 rolls recorded inside).