It depends on how you define "gifted" for the purposes of creating an appropriate learning environment, which I think is the question at this point in the discussion (not the OP's question...).
I define it as the top ~2% (+2 standard deviations) in a given population. Narrowly, this is "in a particular school" and widely it's "in a small number of schools that are near each other." The first definition would probably work in rural areas. The second would be more useful in suburbs or cities.
For me, "gifted" means that the way you learn is sufficiently different from most everyone else that you need a learning environment that's different too.
Again, this is mean to be about creating appropriate learning environments, rather than picking an arbitrary number such as 130. An IQ of 130 may be +2SD in the US population as a whole, but this statistic doesn't necessarily describe four neighboring schools in the Bronx or a college town in northern New Hampshire.
