What is the difference in the average number of players out by lbw and runout in the matches?
out by lbw refers to Out_Id = 4; runout refers to Out_Id = 3; average out by lbw refers to  avg(Player_Out when Out_Id = 4); average out by runout refers to  avg(Player_Out when Out_Id = 3)
SELECT AVG(T1.Player_Out) FROM Wicket_Taken AS T1 INNER JOIN Out_Type AS T2 ON T1.Kind_Out = T2.Out_Id WHERE T2.Out_Name = 'lbw'