What are the movie titles and average rating of the movies with the lowest average rating?
SELECT T2.title ,  avg ( T1.stars )  FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID   =   T2.mID GROUP BY T1.mID ORDER BY avg ( T1.stars )  LIMIT 1
movie titles refers to title; average rating of the movies refers to AVG(stars); movies with the lowest average rating refers to MIN(AVG(stars));