94 BIOMETRY 
difference in the relative number of heads and tails 
than 560 ; 439 becomes very small indeed. Although 
Tails 1 2 3 4 5 6 7 8 9 10 
Fic. 6. 
a throw of all heads or all tails is possible, the odds 
against such a result being ever actually seen are 
1 1 ry n n 1 4 
460 470 480 490 500 S10 $20 $30” 540 
FIG. 7. 
almost inconceivably great. In Fig. 7 the middle 
values for (I+1) are plotted—those combinations 
