26 THE FAMILY AND THE NATION 



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. 



This curve gives the theoretical distribution of 

 frequency for ten coins. In any actual series of 



