I will assume you are part of the nerd faction.
I'll try to break it down for you in a language you understand. .250 is considered mediocre, .300 is considered good. The difference between the two is about 1 hit PER WEEK over the course of a season. Blooper, broken bat dribbler, poor jump by a fielder, etc, etc. can turn a player from an also ran to an All-Star in a season. An AB, game, week, season are all small sample sizes.
You can work with career averages and get an idea of probabilities but you can't figure out the outcome. Because the outcome is from that small sample size of an AB or game.
That's why the game of baseball can't be wrapped up in nice, tidy number by statnerds.