"Virtually all children with IQs lower than 65-70 tend to have organic factors that have interfered with their developmental potential, producing a "blip" in the sever-to-profound range of retardation (Dingman & Tarjan, 1960; Zigler, 1967). In contrast, a few gifted students may demonstrate development that is six or more standard deviations above the mean (Gross, 1993), and despite their rarity, there seem to be more of them than would be predicted by the normal curve (Silverman, 1995). These findings suggest that we now need to reevaluate our concept of intelligence as necessarily conforming to the expected normal curve distribution."
Two tails of the normal curve: similarities and differences in the study of mental retardation and giftedness. by Robinson, Nancy M.; Zigler, Edward; Gallagher, James J.
Linked from: http://www.kreimeier-smith.de/giftedadults.htm
I've read similar remarks from various other sources on giftedness: that the amount of gifted individuals in their little IQ range exceed the predictions of the normal curve.
Where did we get the idea of the normal curve from in the first place? Don't pepele learn in statistics and mathematics that almost no natural phenomenon or effect in the world ever conforms to mathematically derived patterns of distribution and growth?
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