It means more than normal, or more than enough.
extra = keu
The original total was 10000, which is 50 x 200. The two errors mean that there is an extra 180, giving 10180. When that is divided by 200 then 50.9 is the mean.
6 and any extra is always greater than 2 and any extra.
extras
No it is a poo
Extra baggage normally means extra weight or fat
it means extra extra large
It may mean an "extra round" of sex - or sex many times.
an extra-terrestrial, an alien
It means extra extra large.
Extra extra small or large
Surplus is extra.
Extra fast.
"Going the Extra Mile" means that taking whatever you're taking one step further. For example, during school and if there is extra credt offered, "going the extra mile," would mean doing the extra credit. Even if it optional.
an extra email for the website to log in
It is a Spanish size which stands for extra grande and means extra large
Extra Long