  The statistical state for the empirical Pareto's 80/20 rule has been found to
correspond to a normal or Gaussian distribution with a standard deviation that
is twice the mean. This finding represents large characteristic variations in
our society and nature. In this distribution, the rule can be also referred to
as, for example, the 25/5, 45/10, 60/15, or 90/25 rule. In addition, our result
suggests the existence of implicit negative contributors.
