On average, how many grand slams were hit per season (each year) between 1998 and 2008?
In Major League Baseball (MLB) between 1998 and 2008, an average of 135.6 grand slams were hit per season. Thirty teams play 162 games each (with 2 teams participating in each game), so that means that a grand slam was hit roughly once every 18 games.
Each MBL team was batting about 34 times per game, and a grand slam was hit about once every 1,219 times at bat.
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