I know the answer to this but everyone will attack me and tell me to seethe and cope and kill myself so there's no point.
I'd say it's kind of tough to reduce to averages, though, because variance matters a lot, too. /sci/ has some of the smartest people on the site but also some of the dumbest people on the site, and the latter heavily outnumber the former there.
For dumbest it's probably a toss-up between /pol/ and /x/.
>>16332364>/lit/, /g/, /sci/el oh fucking el. The only conclusion I can draw from this is you are not very bright.