Logiclul said:
There are so many people in Africa, South America, and other areas who have zero education, farm for a living (and while this may not be inherent of unintelligence, strongly correlates to it for lack of education) and they outnumber the educated population. I'd hope that everyone on this site for the most part is on the over.
As was stated in the OP, being educated is not the same as being intelligent. Intelligence is generally something you are born with, education is something privileged people receive. There are plenty of educated stupid people but when it comes to living in an environment where survival is far more difficult, you have to be intelligent to survive.
Intelligence is the ability to have a large capacity to learn. Intelligence is NOT booksmarts. I've met people in poorer areas of my city who are just as intelligent as I am without having any of my academic knowledge. They know which people to avoid, which people are easy targets, where to locate these people and many other skills that I haven't learned. In fact intelligence doesn't just test your ability to learn maths or literature, it also tests your ability to learn
skills. I'm willing to bet that there are as many farmers who have a good knack for picking up new skills as there are schoolchildren who have a good knack for picking up knowledge in their favourite subjects.