"Your employer explains that you can get your bonus if you achieve 70 per cent Promoters, 20 per cent Neutrals and 10 per cent Detractors (70P,20N,10D)."
Maybe I don't understand statistics but how does that state that the chance of any one customer being a promoter is 70%? It merely states what you will get as a result of customers being a Promoter or not.