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Slugging average is the ratio of the total number of bases achieved on hits divided by the number of official times at bat. The variables used for hitterswere: batting average (ba), runs batted in (rbi's), slugging average (sa), runs scored (r), strike outs (so), stolen bases (sb), and fielding average (fa).
Definition of average for English Language Learners. : 1  a number that is calculated by adding quantities together and then dividing the total by the number of quantities. : 2  a level that is typical of a group, class, or series : a middle point between extremes.