Warpiglet
Adventurer
Well, because WotC has gone with two points per modifier, things get a bit wonky IMO. While they consider 10 "average", technically it is 10.5 since both 10 and 11 are no modifier. So, really 10 is average, but below I.Q. 100. Really, anything between 86-114 would be represented by 10 or 11. Here's the idea:
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So, an INT of 8 or 9 is below average, but still capable of fully functioning in normal situations. Getting into the I.Q. range of 56-70 or INT 6-7 is where you would have difficulty.
Also, FWIW, most I.Q. tests aren't designed to test scores much below 50 I.Q. And, of course, many individuals have I.Q. scores well above 175, which doesn't really translate since 5E caps scores normally at 20.
Obviously this is far from perfect, but gives a decent basis for someone who wants to think of the comparison between I.Q. and an Intelligence score. But...
This is an idea I've been using since the 1990's, even with 1E before that when a INT 17 was the point of "genius." But, since 5E turned the dynamic of ability scores to not just be natural ability, but also training in appropriate skills, it breaks down.
I like what you are doing. However I would note that historically only about 2.5% of the population has an IQ above 130 if we are using the wechsler III or before.
I can't recall if I actually administered the IV or not but assume it still has a mean of 100 and SD Of 15 as well.
In a like vein a 14 strength would be uncommon in the days of Gygax where a 10 was a person "in good shape" from manual labor! I would have to revisit the lifting capacity in 5e to figure it out as it stands now.
not sure if the IQ stuff helps but interesting project you have.
Another consideration is that IQ and functioning don't always perfectly align. Some people who aren't very quick are more functional than you might guess despite what intelligence is supposed to mean.
I think a 5 INT would most certainly have some form of dysfunction. A 6-7 would likely as well. Heck, an 8 would be noticeable. A 9 could pass for average in many circumstances.
And I hate to say it but we are biased by our cohort. Playing D&D and not sniffing glue in high school led me to a group of friends (still together many years later) who have all been accomplished --maybe I am an outlier and they wonder how I fit

Betting many posters here would notice an 8-9 in their game group after a few sessions. Maybe not.
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