382 



ILLINOIS STATE ACADEMY OF SCIENCE 

 TABLE 6 



GRADE 9 



Showing the distribution of chronological ages, mental ages, total 

 scores (Otis Test) and intelligence quotient equivalents of all pupils 

 in grade 9, (1920). These pupils are selected on the basis of a com- 

 bination of the results in Otis intelligence tests and the teachers' 

 Judgment as the lower half of grade 7 (1918) to go on with Junior 

 High 8th grade work, the upper half to be known as grade 9, effecting 

 the change from the 7-4 plan to the 6-3-3 plan. For distribution in 

 upper half of grade 7, (1918) see table 7, being grade 10 (1920). 



