Quote from nazzdack:
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3) 90/10?......The Pareto Principle in action? :eek:
4)
The Pareto principle (also known as the 80-20 rule,[1] the law of the vital few, and the principle of factor sparsity) states that, for many events, roughly 80% of the effects come from 20% of the causes.[2][3]
http://en.wikipedia.org/wiki/Pareto_principle
