It has nothing to do with superiority. More girls are "average" than boys. More boys are "brilliant" than girls but also more are "dumb". It's about variance an

It has nothing to do with superiority. More girls are "average" than boys. More boys are "brilliant" than girls but also more are "dumb". It's about variance and distribution of intellect among each sex. A boy is more likely to be a genius or a dolt than a girl and a girl is more likely to be competent than a boy overall.