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BELL SYSTEM TECHNICAL JOURNAL 



Each of the thirty-two actual distributions shown in Fig. 9 has 

 been plotted using Fig. 5 as the background, so that the percentage 

 deviations in all distributions may be compared directly by inspection 

 without regard to the magnitude of the a\erage. The examples are 

 divided into four groups according to the number of samples in the 

 series, and are arranged in each group roughly in order of decreasing 

 agreement of the observed with the theoretical distributions. A 



Fig. 8 — Theoretical distribution for a series in which the average a varies continuously 

 and uniformly from 5 to 15 



