Approximately two-thirds (68 percent) of all scores on the WAIS fall between _____ and _____, a range that is considered to indicate normal or average intelligence.
A) 100; 150
B) 50; 150
C) 85; 115
D) 60; 130

Question

Quizplus · Accepted Answer

A score of 100 is considered to be the average score on the WAIS, and the standard deviation is typically around 15 points. Therefore, two-thirds of scores fall within one standard deviation of the mean, which in this case is between 85 and 115.

Approximately Two-Thirds (68 Percent) of All Scores on the WAIS