Signs of Low and High IQ | livestrong

According to the Extreme Intellect website, the average intelligence quotient (IQ) is between 85 and 115, which comes from dividing a person's tested mental age by her chronological age and multiplying that number by 100. Half the population of the United States have IQs of between 90 and 110, with 25 percent higher than that and 25 percent lower.

long standing practice of stupid cops
Court OKs Barring High IQs for Cops
ByABC News
September 08, 2000, 7:32 AM

https://abcnews.go.com/US/court-oks-barring-high-iqs-cops/story?id=95836