Average is all we need ! I mean, working 50% is enough, right ?

A car that starts 50% of the time ?

A plane that stops on 50% of the flights ?

A pacemaker that beats only 50% of the time ?

David Goodenought said that average is enough ..

A car that starts 50% of the time isn't "average". The average new car starts more or less every time. (And if you said 'modal average', I'd say the modal average new car starts every time).