A. 0. POWYS 
43 
Fig. 10. Statures per 1000, Male and Female, Ape 60 and over. Male Curve, firm lines: 
« - '^^'Q'^' „- 8-8304 tan-i 
I U8-2028j ] 
Mean at 66" -26. Origin at 69" -54. 
Mode at 66"-39. Modal Frequency = 151-86. 
Unit of x = l". 
Female Curve, broken lines: 
IQQ'^^ ^-1179 tan 
6-6357 
Mean at 61"-31. Origin at 61" -23. 
Mode at 61" -30. Modal Frequency = 188-57. 
Unit of X = 1". 
The following Table gives the means, modes, standard deviations, and skew- 
nesses of the various age groups*. 
TABLE V. 
Mean 
MOUE 
Standabd Deviation 
Skewness 
Age Group 
Male 
Female 
Male 
Female 
Male 

Female 
Male 
Female 
20—25 
25—30 
30—40 
40—50 
50—60 
60 and over 
66"-95 
67"-30 
67"-15 
66" -91 
66"-74 
66"-26 
62"-60 
62"-76 
62"-44 
62"- 1 2 
62"-22 
6r'-31 
66"-99 
67"-40 
67"-16 
66"-96 
66"-82 
66"-39 
62"-66 
62"-68 
62"-36 
62"-22 
62" -05 
61"-30 
2"-4745 
2" -5624 
2" -5 866 
2"-6181 
2"-6337 
2"-6818 
2"-3654 
2"-4317 
2"-3027 
2"-5552 
2"-5911 
2"-3001 
+ -0163 
+ -0346 
+ -0052 
+ ■0184 
+ -0292 
+ -0478 
+ -0243 
- -0333 
- -0358 
+ 0396 
--0172 
- -0644 
It will be seen that in every group the mean male stature is less than the 
modal stature, while in every female group, except two, the mean stature is greater 
than the modal stature. In the case of these two exceptions the first is the 
youngest group, and the second, Ages 40 — 50, contains a very anomalous set of 
14 dwarfs. The skewness of the distribution is in all cases small, and a normal 
curve would he, as we have indicated, a fair fit. The standard deviations are 
interesting ; in the case of the man they increase with age, or it would appear that 
old men form a more variable group than young men. This is possibly due to the 
* 1 am responsible for some of tlie calculations involved in the determination of the constants 
of this Table, and for the introduction of the following table. K. P. 
