What is the average star rating of the episodes Jim Bracchitta has worked on?
average star rating = divide(sum(stars), count(episode_id)) where name = 'Jim Bracchitta'
SELECT CAST(SUM(T3.stars) AS REAL) / COUNT(T2.episode_id) FROM Person AS T1 INNER JOIN Credit AS T2 ON T1.person_id = T2.person_id INNER JOIN Vote AS T3 ON T2.episode_id = T3.episode_id WHERE T3.stars = 1 AND T1.name = 'Jim Bracchitta'