There's lots of stats along the lines of this floating around from various studies: https://worldpopulationreview.com/country-rankings/average-iq-by-country

I'd take the exact numbers with a grain of salt. IQ is tricky to measure across cultures and there's more than one type of intelligence. There's also the issue that countries are often _not_ homogeneous (a hilarious example of this is how Dutch origin white Afrikaans in South Africa have actually been in South Africa _longer_ than the majority of the black population, as they descend from more recent invaders).

But the rough trends are certainly correct. And the fact that counties _do_ differ is important.

Also, the "more than one type of intelligence" doesn't change the fact that modern technology favors mathematical/logical intelligence: thinking logically is much more valuable than other types of thinking, because machines are so efficient at doing work.

It's interesting how making AI think artistically has turned out to be much easier than making AIs think logically...