SELECT AVG(events) FROM table_name_27 WHERE top_10 = 0 AND tournament = "pga championship" AND top_5 < 0
Berapa jumlah rata-rata acara Turnamen Kejuaraan PGA dengan Top-5 kurang dari 0?
CREATE TABLE table_name_27 (events INTEGER, top_5 VARCHAR, top_10 VARCHAR, tournament VARCHAR)