minimal non-abelian groups with an average condition on subgroups

For a finite group g, the average order o(g) is defined to be the average of all order elements in g. we say that g satisfies the average condition if o(h)leq o(g) for all subgroups h of g. in [on a question of jaikin-zapirain about the average order elements of finite groups, int. j. group theory, to appear] we proved that every abelian group satisfies the average condition. in this paper, we classify minimal non-abelian groups which satisfy the average condition.