No reliable record exists of Sidis ever taking a standardized IQ test. The frequently cited claim that he scored between 250–300 on an IQ test stems from a single, uncorroborated account by psychologist Abraham Sperling in his 1946 (2 years after Sidis’ death) book Psychology for the Millions.
The concept of IQ as measured by modern tests did not exist during Sidis’s childhood
i mean, iq is a normal distribution. it caps at 200. 160 represents the 99.996th percentile, and above that the error bars are so large that the result is uneless.
It’s not capped, really. But the claimed 250 IQ would be 10 standard deviations from the mean, so he’d be the most intelligent person in a population of ~1024 people.
~1011 humans have ever lived on earth.
Wikipedia
i mean, iq is a normal distribution. it caps at 200. 160 represents the 99.996th percentile, and above that the error bars are so large that the result is uneless.
It’s not capped, really. But the claimed 250 IQ would be 10 standard deviations from the mean, so he’d be the most intelligent person in a population of ~1024 people.
~1011 humans have ever lived on earth.