These three stocks boast an average yield that is more than three times the average dividend payer in the benchmark S&P 500 index.The market's been on a bull run, but most of the gains have been confined to a handful of tech stocks at the top. There are still plenty of high-yield dividend stocks that haven't gained as much attention as they probably deserve.Investors looking for near-certain ways to grow the stream of passive income their retirement accounts produce have some terrific options. Medtronic (MD ...