13% of the world population have an IQ higher than 117. That means that there is a billion non jew that has an IQ higher than the average Ashkenazi. Thus your arguments makes no sense. Even if every single jewish person had a high IQ, they will be less than 1% of the pool.
Well, there is the part about the selection pool, but there is also how a normal distribution behaves far out on the tail.
Most Nobel Laureates in the sciences are highly intelligent, so they exist on that tail.
Basically, if you sample from the top 13% from a normal distribution with (mean, std)=(100,15) you get fewer with 140+ than if you sample from one with (mean, std)=(115,15), and the higher the intelligence, the bigger the difference will be.
This follows from the squaring of the exponential term in the standard distribution.
While it's possible that the shape or standard deviations for various population doesn't match my assumptions, but if they do, the observed number of Nobel prizes given to Jews is very close to what one would expect.
