"If the distribution of intelligence is supposed to be normal and the mean is 100, then an IQ of 150 would be just as likely as one of 50, and an IQ of 200 would be just as likely as one of 0, and one of 220 just as likely as one of -20."
What? Except anything outside of 145 and 55 on a cog battery is beyond 3 SD and is so rare that it doesn't really have an effect. Cognitive assessments are normed on such a massive data set that, as others have mentioned, the average is essentially the same as the median. Just like any large data set that fits under a normal curve.
Source: This is my job
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