what is a fast wpm typing rate
Comparison of typing speeds, like most other things, is very subjective. A typing speed of 84 wpm is certainly much higher than that of an average person. I'd say that most people who haven't learnt touch typing would key in under 60 wpm. If you're comparing yourself to such people, than yes, 84 wpm is really high. However people who do learn touch typing in can key in much faster.