Back in 2022 I estimated Elon Musk’s IQ,

At the time I wrote that I had no idea Musk had taken the SAT (since it’s not required in Canada) but it turns out he did as revealed by the Walter Isaacson biography released this month:

If all American 17-year-olds had taken the SAT in the 1980s, it would have had an estimated a mean and standard deviation of 787 and 220 respectively, so Musk’s combined score of 1400 equated to +2.79 SD or IQ 142 (U.S. norms) or about 140 if you like round numbers.

140 makes sense. Smart enough to launch rockets and become the World’s richest man, but still dumb enough to get fleeced out of tens of billions of dollars when buying twitter.

Even though it’s generally a bad idea to try to guess someone’s IQ from their wealth alone, in Elon’s case it made perfect sense because my intuition told me he was smarter than half the Americans who reached his level of wealth (i.e. Sam Walton) but dumber than the other half (i.e. Bill Gates).