Common mistake
Believing a small rich minority can't drive the mean
It sounds like this
“Only a handful of people earn millions, so they can't be what's pushing the average income up.”
Why it’s wrong
Each of those few adds an amount many times the typical one to the total, so a handful can move the mean further than everyone else put together.
The lesson that fixes it
Cognosc spots mistakes like this.
When you explain something in your own words, Cognosc can tell exactly which mistake you’re making — not just that you’re wrong — and gives you a short lesson to fix that one thing.