PROBLEM 150 



175 



instructor will give you an individual number. Hand in your 

 results with your number to one pupil of the class who will tabulate 

 the figures on the board. 



Make a graph showing the individual variation in circumference 

 of the wrist in the members of your class. 



Conclusion. — Is there variation in this measurement among the 

 members of your class ? 



20 



21 



2a 



23 



24 



2S 



Note. — Exercises on variation are numerous and may be worked out from 

 charts, from collected material showing variations, or from work done by pupils in 

 the field. In every case where possible, a graph should be made to illustrate the 

 normal and the variation from the normal. The exercise that follows will show 

 the method to be used. 



