Average score for questions and answers, by tag

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For all canonical tags, what is the average question score and the average answer score?

Christianity

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SELECT Tags.TagName AS [Tag Name]
     , AVG(Answers.Score) AS [Average Score]
     , STDEV(Answers.Score) AS [Score StdDev]
    FROM Tags
        INNER JOIN PostTags
            ON PostTags.TagId=Tags.Id
        INNER JOIN Posts AS Questions
            ON Questions.Id=PostTags.PostId
        INNER JOIN Posts AS Answers
            ON Answers.ParentId=Questions.Id
    WHERE
        Answers.PostTypeId=2
    GROUP BY Tags.Id, Tags.TagName
    ORDER BY 2 DESC, 3, 1

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