NORMAL VARIABILITY 



87 



difference in the relative number of heads and tails 

 than 560 : 439 becomes very small indeed. Although 



Tails 123456789 10 



FIG. 6. 



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

 against such a result being ever actually seen are 



80 490 500 510 S20 530 540 



almost inconceivably great. In Fig. 7 the middle 

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



