It is a common misconception that the people of Israel have higher IQ than other nations. They have not. The nations with highest IQ are all in Eastern Asia: China, Japan, South Korea.
Highest average IQ? What percentage of Chinese were tested?
In such statistics, sufficiently big samples are taken to achieve significance. I think it goes without saying that the percentage (compared to total population) of such samples is rather small, and not smaller for China than for Europe or the US.
Ok, so it would be a small percentage for any country. I guess what I'm wondering is how many dumb kids they don't let in their schools heh. In the United States, even if the child is very dumb or doing very poorly they usually get to graduate.
I'm sure that statement is not biased at all.