re: "Half the schools are below average" - not always true

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And its your idea that those unaccounted for variables will just happen to add up in exactly the right way to cancel out the skewed distribution of resource allocation in the 90/10 example? Come on man!

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Besides the implausibility of your (90/10) example, there are still so many other conditions at play here; resources being only one. Furthermore, we are dealing with variables that have developmental limits. You could spend a trillion dollars on one school, and you would quickly start to get diminishing returns.