[Gideon7]

Langan (born March 25, 1952) is an American whose IQ was reportedly believed to be “between 190 and 210”.

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The IQ scale is normalized at one standard deviation per 15 points. An IQ of 190 is 9.9x10^-8% of the human population (about 1 in one billion people), 200 is 1.3x10^(-9)% of the population (about 1 in 76 billion people), and an IQ of 210 is 1.1x10^(-11)% (about 1 in 9 trillion people). Source: https://www.wolframalpha.com/input/?i=iq+210

Given the that the world’s population is about 7.6 billion, the IQ for the world’s smartest human should be around 194-195.

[Nifster]

His claim is based on his self reporting of an IQ test in Omni Magazine

Hardly a rigorous evaluation

[steve86]

"Given the that the world’s population is about 7.6 billion, the IQ for the world’s smartest human should be around 194-195."

No, the average for a "population" of "world's smartest humans" should be about that. Variability within that group is permitted and any one of the individuals might far exceed the average.