The average bank yields 2.5%. This trio of banks all yield well north of that figure as November gets underway.There's nothing wrong with going for the average and buying index funds when it comes to investing. But if you are trying to generate investment income you might want to go a more direct route. For example, the average bank yields around 2.5% today, using SPDR S&P Bank ETF (KBE 0.54%) as an industry proxy. KeyCorp (KEY -0.99%), Toronto-Dominion Bank (TD -0.23%), and Bank of Nova Scotia (BNS -0.31%) ...