You might want to goggle up something like nations IQ.
There are some countries with a average IQ of 65. They would be lucky to earn a D in a class for monkeys. Thats 33 points lower than the 98 mean in the US.
I can understand the IQ thing, and I'm not debating this. I do have a hard time understanding how there could be a guy anywhere who can't comprehend "If I drink another beer, I'm going to have to have a wee soon"
Don't rely on IQ tests as a measure of another cultures intelligence, there are far too many problems with them.