So much depends on context. When headlines say "Florida man" did this or that (in the non-Trump meaning) it tends to say average or below average who you've never heard of.

If you want to do the math then in the spread, 25% would be below average, you could give the middle 26 to 50% as average, and the top IQ or some other functional measurement to the 76-100% of the group. Or you could do 33.3 for each group.

100% of the people who vote for the majority of the GOP slate of electors at least have a screw loose if they can't figure out that they're being taken to the cleaners by Trump's gang.