Intelligence Test IQ Scoring and Norms

Question 1

What does IQ stand for?

Accepted Answer

Intelligence Quotient

Answer

IQ stands for Intelligence Quotient, a score derived from standardized intelligence tests.

Question 2

On most modern IQ tests, what is the average (mean) score for the general population?

Accepted Answer

100

Answer

Modern IQ tests are normalized so that the average score is 100, with a standard deviation of 15.

Question 3

The original IQ formula was Mental Age divided by Chronological Age, multiplied by 100. Who developed this formula?

Accepted Answer

William Stern

Answer

William Stern introduced the mental age ratio formula (MA/CA × 100) as a way to express intelligence as a single number.

Question 4

What IQ score range is typically classified as 'average' intelligence?

Accepted Answer

90–109

Answer

Scores between 90 and 109 are generally classified as the average range on most standardized IQ scales.

Question 5

What percentage of the population scores between 85 and 115 on a standard IQ test?

Accepted Answer

68%

Answer

Approximately 68% of people fall within one standard deviation (±15 points) of the mean score of 100.

Intelligence Test Practice Test