It’s July 1 of any year. Your favorite team has played about half the season and has been struggling at the plate recently. The team batting average is .234 compared to the league average of .246. This solitary datum indicates that the team’s batting average is well below the league average. But what is the history of team batting average over the course of the season? Has the team been consistently below average or is this a result of their recent struggles at the plate?