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If you know that the mean IQ score for the U.S. population is 100 and that one standard deviation (SD) is 15 points then what is the range of IQ score for people 2 SD above and 2 SD below the mean?

  1. 70- 130

  2. None of them are correct.

  3. 15-45

  4. 0-100

  5. 85 -115

Answer:

A