DraganFill

Hi, I'm trying to follow my speed over some date range. And results are eg: 35, 55, 50, 40, 60, 290, 45 55 ... At some point among 20 tests I got some extreme result (like 290 in upper example). This extreme result is giving me wrong average speed. So average calculation should remove extreme maximums and minimums. Can I fix this somehow?