They said "on average". Selecting 30 of the most talented from the poorest group does not contradict that.
On average more educated? Yes. More intelligent? Nah I see no data. Given the same access to resources I expect the kid from a poor family and a kid from a rich family to perform similarly.
On average more educated? Yes. More intelligent? Nah I see no data. Given the same access to resources I expect the kid from a poor family and a kid from a rich family to perform similarly.