Excerpt from The American Journal of Psychology, 1906, Vol. 17

Adding digits in isolated pairs differs greatly from adding digits in series. The time in the latter case is by no means as even as Arnett's results would seem to indicate.' A wide range of variation is usually present. The average times per digit added were as follows: Kn, sec, K, L, J, T, B, Average range of variation per digit added Kn, 37, K. 67, L. 36, J. 45: T, 59: B, 39.

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