CREATE TABLE table_name_50 (win_average NUMBER, races_ridden VARCHAR2, nationality VARCHAR2, name VARCHAR2)

What is the average win as a percentage of German racer Rudi Altig, who has ridden in over 79 races?
SELECT AVG(win_average) FROM table_name_50 WHERE nationality = "german" AND name = "rudi altig" AND races_ridden > 79
SELECT AVG("win_average") FROM "table_name_50" WHERE "german" = "nationality" AND "name" = "rudi altig" AND "races_ridden" > 79