Why is the average IQ equal to 100?
(a) that is just the nature of intelligence; it could not be otherwise
(b) all normal distributions have an average of 100
(c) it is just a lucky accident; it could have come out any way
(d) Binet originally used a ratio, MA/CA, defined so that the mean MA had to
equal the mean CA. That ratio was then multiplied by 100. Today, test scores are
statistically adjusted so that average performance is set equal to 100.
D
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