Which of the following statements is true about intelligence quotient?
a. The average IQ score varies from age group to age group.
b. About two-thirds of all IQ test-takers score between 85 and 115.
c. The distribution of IQ scores in the general population is asymmetrical and shaped like a ski jump.
d. Very high and very low IQ scores are the most common in the general population.
Answer: b
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