412 H. S. JENNINGS AND K. S. LASHLEY 



In this case I have worked out by formula (3) the value of the 

 probability for all possible numbers of pairs; the results are given 

 in table 36. 



From this table is plotted the curve of figure 1 (page 407). 

 The curve shows directly to the eye how great is the divergence 

 of the observed result from what should be expected if the dis- 

 tribution of deaths has no relation to the mating; the ordinate of 

 13, the actual number of pairs, is far from that of the most prob- 

 able number of pairs. By our rule (5) we find that the probabiUty 

 of so great a deviation as 6 from the most probable number is 



out of a total of 186. 



