Final answer:
Most people score near 100 on intelligence tests, which is the standardized mean, forming a bell curve distribution of scores around this average.
Step-by-step explanation:
Norms for intelligence tests are established so that the average score is a standardized mean of 100. This is the point at which most people score, with scores distributed in a pattern that forms a bell curve around the mean. A score of 100 is considered average intelligence. Scores that fall within one standard deviation, which on most modern IQ tests is 15 points, are considered within the average range. Therefore, a score between 85 and 115 is within the average range, and 68% of the population has IQ scores within this range. To answer specifically, most people score near 100 on intelligence tests, which is the choice (d).