42 



GENETICS IN RELATION TO AGRICULTURE 



TABLE V. To COMPUTE THE STANDARD DEVIATION IN MEAN TOTAL YIELD OF PLANT 

 IN GRAMS (Complete Process Including Calculation of the Mean) 



ff = 



700.372 

 400 



= 1.323. 



TABLE VI. To COMPUTE THE STANDARD DEVIATION BY THE SHORT METHOD 

 Let assumed mean = G = 3.5; V G = d' 



M = G + w 



= 3.5 + (-0.0425) 

 = 3.458 



w* = 0.0018 

 1.7525 - 0.0018 = 1.7507 



a = Vl.7507 = 1.323 



Check: 2(/) + 2S(/.d') + 



= 1067 = 



+ 1)'] 



The short method for computing the standard deviation is based upon 

 the same principle as the short method for the mean. The rule, therefore, 

 is as follows: Select some number approximating the mean (G); write 

 the minus and plus deviation therefrom (d')l multiply each deviation 



