SQL: AVG of TOP 3 Number

SET = { 20.00, 20.00, 17.67, 17.67, 17.67, 17.67, 15.00, 15.00, 15.00, 15.00} TABLE row values

select AVG(ConvertedMarks) AS AVGR from
(
SELECT TOP 3 ConvertedMarks FROM T_Term_Class_Test order by ConvertedMarks DESC
)T

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