IQ scores are categorized as "superior" or "average" based on test results. IQ 100 means average performance in same-age test-takers. About two-thirds of test-takers score between 85-115. IQ scores are ordinal, not interval measurements
IQ stands for Intelligence Quotient, coined by William Stern in 1912. It measures logical reasoning ability and compares mental performance to peers. IQ is calculated as mental age divided by chronological age multiplied by 100
Northwestern University study shows US IQ scores decreased from 2006 to 2018. US national IQ is 97.43 after adjusting for sample size and ethnicity. Average IQ scores range between 85 and 115 globally
No significant gender difference in average IQ scores between men and women. Both genders have an average IQ of 100. Men excel in spatial intelligence and math, while women score higher on verbal tests
Average IQ score is 100, with 68% falling between 85-115. Scores range from 1-24 for profound disability to 180+ for genius. IQ tests measure fluid and crystallized intelligence
Marilyn Vos Savant holds Guinness World Record with 228 IQ. Leonardo da Vinci's estimated IQ between 180-220. William James Sidis claimed IQ between 250-300. Terence Tao's IQ estimated between 225-230