The average will have the same data type as the values, so cast the values:
SELECT ROUND(AVG(CAST(column_name AS FLOAT)), 2) FROM [database].[dbo].[table]
The average will have the same data type as the values, so cast the values:
SELECT ROUND(AVG(CAST(column_name AS FLOAT)), 2) FROM [database].[dbo].[table]