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. 2015 Feb 17;10(2):e0117972. doi: 10.1371/journal.pone.0117972

Fig 1. The distribution of leading digits in end-of-chapter excercise answers from two popular introductory physics textbooks (Knight, Young & Freedman) and an analytical chemistry textbook (Skoog).

Fig 1

The dashed horizontal line indicates uniform distribution of first digits. Overlaid black squares are the theoretical Benford’s Law distribution.