alleryModern IQ scales usually set the standard deviation near what?
A5
B25
C50
D15
Answer & Solution
Correct answer: D. 15
1. Recall the fact: By convention the mean is 100 and the standard deviation 15 or 16.
2. The option "15" matches it.
3. Why the others fail: 5, 25 and 50 are not the usual spread.
_Source: Wikipedia, "Flynn effect" (CC BY-SA, rev 1375564293), section "Lead section"_
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