Intelligence and Achievement

AP Psychology· difficulty 3/5

100 85 115 70 130

IQ is normed so that the mean is 100 and the SD is 15. Approximately what % of people score between 85 and 115?

  • A

    50%

  • B

    95%

  • C

    68%

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  • D

    99.7%

Explanation

±1 SD captures about 68% of a normal distribution.

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