SQL SUM/ AVG TOP 3 Number from a set of 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 TOP 10ConvertedMarks FROM T_Term_Class_Test order by ConvertedMarks DESC
SELECT MAX(ConvertedMarks) AS ConvertedMarks FROM T_Term_Class_Test
SELECT TOP 3 ConvertedMarks FROM T_Term_Class_Test order by ConvertedMarks DESC
SELECT AVG(ConvertedMarks) FROM T_Term_Class_Test WHERE ConvertedMarks IN (SELECT TOP 3 ConvertedMarks FROM T_Term_Class_Test ORDER BY ConvertedMarks DESC)
SELECT SUM(ConvertedMarks) FROM T_Term_Class_Test WHERE ConvertedMarks IN (SELECT TOP 3 ConvertedMarks FROM T_Term_Class_Test ORDER BY ConvertedMarks DESC)

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