CAST(SUM(CASE WHEN type = 'X' AND (event = 'Single' OR event = 'Double' OR event = 'Triple' ) THEN 1 ELSE 0 END) AS float)
/ CAST((COUNT(DISTINCT ab_id) - SUM(CASE WHEN pitch_num = 1 AND (event = 'Catcher Interference' OR event = 'Sac Bunt' OR event = 'Sacrifice Bunt DP' OR event = 'Walk' OR event = 'Intent Walk' OR event = 'Hit By Pitch' OR event = 'Strikeout' OR event = 'Home Run' OR event = 'Runner Out') THEN 1 ELSE 0 END)) AS float)