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76 225 376 525 675 925 975 Jie5 (1875 1425 15758 /725 /878 2025 2175 232.5 
Er Fig. 1. Frequency polygon and fitted curve for variation in annual egg production. 1905—06 150 bird pens. 
The zigzag line gives the observed frequencies. The curve is of Pearson’s Type II and has the following equation; 
26 
