Using a standard deviation of 15 IQ points, a person with an obtained IQ score of 115 would have a z score of:

A. +1
B. +2
C. 0
D. ?1


A.
Explanation: A person with an IQ score of 115 would have a z score of +1 because on tests measuring intelligence the mean IQ is 100 and the standard deviation is 15 IQ points. One standard deviation above the mean would be 115, represented by the z score of +1.

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