Twenty-five leaves were selected at random from each of six similar apple trees in an
orchard, and the adult female European red mites on each leaf were counted. They were used by Ross and Preece (1985) and
studied by the negative binomial distribution.
References
Ross, G. J. S., & Preece, D. A. (1985). The negative binomial distribution. Journal
of the Royal Statistical Society: Series D (The Statistician), 34(3), 323-335.