29G 



Miss M. Beeton and Prof. Karl Pearson. 



which was nearly symmetrical, absolutely symmetrical, by entering 

 into the table each pair of brothers twice, an individual first appearing 

 -as a first brother and then as a second brother. Thus the mean age at 

 death and variability of age at death of both sets of brothers appears 

 the same, and we have a nominal 2000 instead of a 1000 entries. Of 

 course in calculating the probable errors of the constants, 1000 has 

 been taken as the number of observations. We shall now consider 

 these diagrams and tables a little at length. 



Fig. 1. — Diagram giving Mean Age of Fathers at Death for Sons dying at a given 

 age. First Series, 1,000 cases. 







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45 50 55 60 65 70 75 80 65 90 95 100 



Mean Age of Fathers at Death. 



