Team slugging percentage is measured by the sum of total bases a team accumulates in a game divided by their total at bats in a game. Total bases is found by finding the sum of (1B x 1) + (2B x 2) + (3B x 3) + (HR x 4).
More about Team Slugging Percentage
Teams that get a lot of hits in an average game will have a high team slugging percentage, though that percentage will be especially high for teams that accumulate a high number of extra base hits, as those are the hits that really add to the total bases total. Individual sluggers with a high team slugging percentage can obviously skew the team percentage on the high side, though to maintain a high overall team slugging percentage a team must have multiple hitters with a propensity for obtaining extra base hits.