Answer: Hello mate!
if 100 is the mean and 13 is the standard deviation:
(140 - 100)/13 ≈ 3
this means that the value where the geniuses start to appear is equal to the mean plus 3 times the standard deviation.
We know that the percentage that lies after the mean plus 3 times the standard deviation is 0.1% of the population.
Then, if the population is 6,575,000,000
the 1% of this number is equal to:
(1%/100%)*6,575,000,000 = 0.01*6,575,000,000 = 65,750,000
So there are almost 65,750,000 geniuses in the world.
