excel formula

I have two teammates and they each have an index.  player 1 is 6.6 and player 2 is 10.2

I need a formula that will take lower index twice and higher index once.  add them together and divide by 3

in my spread sheet though, i have several teams and the players are not always listed with the smaller index first.  Can a formula decipher which index is smaller and use it twice?  or do i have to order them smaller one first?