###HUMAN: which tag is used in questions with the highest average score, excluding tags used in less than 5 q., ###ASSISTANT: SELECT Tags.TagName, AVG(CAST(Posts.Score AS FLOAT)) AS avg, COUNT(Posts.Id) AS count FROM Tags LEFT JOIN Posts ON Posts.Tags LIKE '%' + Tags.TagName + '%' GROUP BY Tags.TagName HAVING COUNT(Posts.Id) >= 5 ORDER BY avg DESC LIMIT 1