Q&A for speakers of other languages learning English
CREATE TABLE #Numbers ( Number DECIMAL(10,4), Variance DECIMAL(10,4), VarFloat Float ); GO INSERT INTO #Numbers (Number) VALUES (23), (37), (45), (49), (56), (63), (63), (70), (72), (82); GO DECLARE @Mean DECIMAL(10,4); SET @Mean = (SELECT SUM (Number) / COUNT(Number) FROM #Numbers); -- @Mean is 100 UPDATE #Numbers SET Variance = POWER( (@Mean - Number), 2), VarFloat = Power( (Number * 1.0 - @Mean), 2); DECLARE @StdVariance DECIMAL(10,4); SET @StdVariance = (SELECT SQRT( SUM(VarFloat) / COUNT(Number) ) FROM #Numbers); SELECT @Mean AS [Mean], @StdVariance AS [Standard Variance], Sum(Number) as [Sum], count(Number) as [Count], sum ((Number - @Mean) * (Number - @Mean)) as [SumVar], Avg(Number) as [Avg], StDev(Number) as [StdDev] from #Numbers