What's the average rating score of the movie "A Way of Life"?
A Way of Life' is movie_title; average rating score = Divide (Sum(rating_score), Count(rating_id));
SELECT AVG(T1.rating_score) FROM ratings AS T1 INNER JOIN movies AS T2 ON T1.movie_id = T2.movie_id WHERE T2.movie_title = 'A Way of Life'