The IQ curve is normal, with a mean of 100 and a standard deviation of 15.If "normal" IQ is defined as a score within 1 standard deviation of the mean, what range of scores is considered "normal"?
A) 85-115
B) 75-125
C) 100-115
D) 85-100

Question

Quizplus · Accepted Answer

One standard deviation below the mean is 100 - 15 = 85, and one standard deviation above the mean is 100 + 15 = 115. Therefore, "normal" scores would fall between 85 and 115. Choice A is the only option that includes this range.

The IQ Curve Is Normal, with a Mean of 100