Overall, about 98 percent of people have a score below 130. The IQ scores of most people are represented in the middle of the bell, between 85 and 115. Lower scores are represented on one slope of the bell while higher scores are represented on the other. The very peak of the bell represents the average score of 100. They may have different methods of scoring, but they all use 100 as the average. Today, there are several versions in use. IQ tests have gone through significant changes through the decades to correct for racial, gender, and social biases, as well as cultural norms.
