Haggerty: Study in Arithmetic 



449 



gether pupils of the same ability. An apparent closeness of grad- 

 ing may be secured by spending- much time on the weak pupils 

 and little on the strong so that all will do about the same work. 



100 



90 



80 



70 



60- 



50 



1 17 



10 



14 



40 



AVERAGE 



"rights 



^ n iS 



13 



AXERAGE 

 .\TTEMPTSl 



30 - 



20 - 



10 



Tia2Q - VARIABiLnT SERIES B GRADE 5 DIVISION 



The latter method seems to be regarded by some as efficient teach- 

 ing. It may be doubted whether it really is. In any case if the 

 class is homogeneous, the students being all very much alike in 

 achievement, the per cent of variability will be low. Inversely, a 



—3102 



