Yes, and...? 75% doesn't mean that you will hit every 4 hits. That wouldn't be random. You always roll 1-20 and on every roll you have 75% chances of succeeded. Everytime you swing you have 1 in 4 chances to miss. Those are pretty solid odds at missing. Hey, I had a double 1s couple times. That happens, it's random.
Here is legedary Tim Cain (Fallout1 Troika games etc) talking on randomeness in games.
