Statisticians and smarter people, please correct me if I am wrong since my only experience is one statistics class in college, but this could be true if you have a lot of extreme outliers on the lower end than the upper end.

Averages are just that - an average. If you have 1000 people and 750 of them have IQs below 60 and the rest have “normal” IQs, then your average will skew to the lower IQs. I would wager median and mode would be better for this kind of stuff.