I took the original post to be looking for what should be a reasonable number for his players to achieve. It's kind of the wrong question to ask; what you should be looking at is how your players stack up against the others in your world. So yes as Mike suggests, sort the league leaders and find out where your players sit.
Since the OP is also interested in groundball pitchers, he might also want to check his team pitching stats, find out what his staff is good and poor at.