My dad always talks vaguely about how 'only 20% (or some other small figure) of the population has the kind of brain equipped with the machinery to process [insert high-level mathematical process, e.g. sophisticated engineering technique or something of the like].' This also applies to people's struggles with probability (e.g. neglecting base rates), et cetera. I was wondering how much of math's talent is just there or not there from birth, vs capable to be learned. Thanks.
In particular, is the majority of the population actually unequipped with the mental machinery (like, say, a frog) to process high-level (say, advanced high school and beyond) maths? Prediction: no.