CREATE TABLE table_name_70 (score INTEGER, champion VARCHAR)
SELECT AVG(score) FROM table_name_70 WHERE champion = "joanne carner"
คะแนนเฉลี่ยของ Joanne Carner ในเกม Canadian Women's Open ที่เธอชนะคือเท่าใด
What is Joanne Carner's average score in Canadian Women's Open games that she has won?