I'm sorry I overstated it, but using means of large numbers of samples is not a very strong statistical approach. There is no way to know from the data given. The run scoring matrix doesn't give any indication of the difference in the situations. They may have simply been scenarios with the 5th hitter getting on to start an inning, etc. As for sacrificing, it depends on the individual batters. I'm not suggesting a .300 hitter bunt a runner over. It depends on the hitters behind a certain player and the particular probabilities of a certain player obtaining a certain result.