The height of the average male (178cm) is more than one standard deviation (8.9cm) above the height of the average female (165.1cm). I don't really know if we

The height of the average male (178cm) is more than one standard deviation (8.9cm) above the height of the average female (165.1cm). I don't really know if we should be surprised that the differences between male and female brain volumes are also statistically significant and larger than one standard deviation.