What is the average IQ score on modern IQ tests?

The average IQ score on modern IQ tests is consistently set at 100. This standardization is based on a normal distribution, where the scores are arranged around a mean of 100 with a standard deviation typically of 15. This means that approximately 68% of the population scores within one standard deviation of the mean, which is between 85 and 115. Setting the average at 100 allows for a clear understanding of how individuals are performing in relation to the general population. Thus, the selection of 100 as the average IQ score reflects the normative framework used in the design of these assessments.