Seven-number summary (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Seven-number summary" in English language version.

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6^th place

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archive.org

Bowley, A. (1920). Elementary Manual of Statistics (3rd ed.). p. 62. the seven positions are the maximum and minimum, median, quartiles, and two deciles
Tukey, J. (1977). Exploratory Data Analysis. Addison-Wesley Publishing Company. p. 53. ISBN 978-0-201-07616-5.