NORMAL VARIABILITY 



87 



difference in the relative number of heads and tails 

 than 560 r 439 becomes very small indeed. Although 



Tails 



23456789 



FIG. 6. 



a throw of all heads or all tails is possible, the odds 

 against such a result being ever actually seen are 



600 SIO S20 WO 



FIG. 7. 



almost inconceivably great. In Fig. 7 the middle 

 values for (i + i) 999 are plotted those combinations 



