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For example, a child who hits exactly the 98th percentile on every subtest of the WISC-IV, will get a FSIQ that's at the 99.9th because he's so consistently rare across the board.

Just curious--how often do these kids exist? I feel like whenever I see the breakdowns of high-scoring kids, there is something low in there, usually processing speed or coding or some of the memory tasks, right?