46 



Plant-Breeding 



multiplying the mid-value of each class, say 5.8, by the 

 number in that class, adding their products, and dividing 

 by the total number of individuals. This is expressed 



by the formula M (mean) = * where V represents the 



n 



variables, / the frequency of each variable, n the total 

 number of individuals, and 2 the summation of fV. 



Mean, 



445L8 

 286 



Use of mean. The mean gives a good average value 

 of the character and is often more useful than the mode 

 in expressing type. The breeder must use his judgment 



