Team total bases per game is the sum of all bases earned by batters via a hit over a game. A batter is credited with one base for reaching on a single, two from a double, three from a triple, and four from a home run. These bases are credited regardless of whether anyone was on base at the time as well as regardless of how far baserunners advanced as a result of the hit.
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Total bases is what is used to compute slugging percentage as well, and both measures are adequate ways to measure both a team’s total offensive output as well as their propensity towards extra base hits.