Palladium RPG too!
Found
this neat article that does a deep dive on the subject. I guess it was more just for the Int stat for monsters?
I was curious though, so I pulled up the
3d6 bell curve and compared it to an
IQ test distribution and came up with the following:
Int 3 = IQ 61 (Extremely low)
Int 6 = IQ 80 (low average)
Int 9 = IQ 95 (average)
Int 12 = IQ 110 (high average)
Int 15 = IQ 125 (superior)
Int 18 = IQ 150+ (very superior)
Seems to me the AD&D descriptors tracked, but not so much the IQ x 10. Also, the lowest roll possible would only indicate a scholastic equivalence of a 3rd grader, far from the drooling, mindless idiot I imagined.