Average oxidation number

The average oxidation state of chlorine in bleaching powder is

Ozonolysis of ClO_2 produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is------.

The average oxidation state of sulphur in Na_2S_4O_6 is

The average oxidation state of sulphur in Na_(2)S_(4)O_(6) is

What is the average oxidation state of oxygen In S_2O_8^2-

The average of x numbers is y^(2) and the average of y numbers is x^(2) . Find the average of all the numbers taken together