What are the titles of the episodes that have received more 7-star votes than the season average?
episodes that have received more 7-star votes than the season average refers to votes > DIVIDE(SUM(votes), COUNT(stars = 7))
SELECT DISTINCT T1.episode_id FROM Episode AS T1 INNER JOIN Vote AS T2 ON T2.episode_id = T1.episode_id WHERE T2.stars = 7 AND T2.votes > 0.7 * ( SELECT CAST(COUNT(votes) AS REAL) / COUNT(CASE WHEN stars = 7 THEN 1 ELSE 0 END) FROM Vote );