The percentage of those individuals with an IQ score below 70 is __________ percent.
A)2.2
B)6.7
C)16.1
D)50

Question

Quizplus · Accepted Answer

The percentage of individuals with an IQ score below 70 is approximately 2.2 percent. This is based on the properties of the normal distribution, as IQ scores are typically distributed with a mean of 100 and a standard deviation of 15. A score of 70 is two standard deviations below the mean, and in a normal distribution, about 2.2% of the population falls below this threshold.

The Percentage of Those Individuals with an IQ Score Below