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If IQ Scores Are Normally Distributed,having a Mean of 100

question 315

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If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores somewhere between 70 and 130?


Definitions:

Crystallized Intelligence

The aspect of intelligence that involves the ability to use learned knowledge and experience.

Fluid Intelligence

The capacity to think logically and solve problems in novel situations, independent of acquired knowledge.

Concrete Operational Thought

A stage in Jean Piaget's theory of cognitive development where children (ages 7-12 approximately) gain the ability to think logically about concrete events.

Fluid Intelligence

The ability to think abstractly, reason, identify patterns, and solve problems quickly in novel situations.

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