26 THE FAMILY AND THE NATION 



Head*. 

 IO 



9 

 8 



7 

 6 



5 



4 

 3 



2 

 I 

 O 



Tails. 

 O 



I 

 2 



3 

 4 



5 

 6 



7 

 8 



9 



10 



Relative Frequency. 



I 

 10 



45 

 1 20 



2IO 

 2 5 2 

 210 

 120 



45 

 10 



i 



If we plot these results on a diagram, measuring the 

 number of tails from left to right horizontally, and the 

 number expressing the relative frequency in each case 

 vertically, we get Fig. i, where a smooth curve is 

 drawn through the points as plotted. 



TAILS 

 FIG. i. 



This curve gives the theoretical distribution of 

 frequency for ten coins. In any actual series of 



