On average, how many players from each country bat with their right hand?
bat with their right hand refers to Batting_hand = 'Right-hand bat'; average = divide(count(Player_Id) when Batting_hand = 'Right-hand bat', count(Country_Name))
SELECT CAST(SUM(CASE WHEN T1.Batting_hand = 'Right-hand bat' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T2.Country_Name) FROM Batting_Style AS T1 INNER JOIN Player AS T2 ON T1.Batting_id = T2.Batting_hand