Common mistake
Assuming mean and median are always close
It sounds like this
“Mean or median, it hardly matters — they'll be within a few percent of each other anyway.”
Why it’s wrong
They only sit together when the numbers are balanced; with a long tail they can be far apart, and which one is quoted changes the story.
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.