The accuracy is calculated compared to other readers, so if you all clicked on the wrong corner you can still be better than 80% of them!
I mostly did it this way because there's no hard number that makes sense here - we don't know ft/metres, and pixels aren't a unit everyone is used to thinking about.
I mostly did it this way because there's no hard number that makes sense here - we don't know ft/metres, and pixels aren't a unit everyone is used to thinking about.