Filtering data and review

In review tasks a table is usually prepared in this order: build and format a table with headers, calculate with formulas (age = current year – birth year, average = total : count), then sort in the order needed and filter by a condition. For example, add a “group” column to a table of subjects, write 1 for natural sciences and 2 for social sciences, sort by group and then subject name, and filter those with an average of at least 4. After sorting, check the result: does each row still keep its own data, and are the formulas right? Do not post a table with classmates’ personal data such as names and birth dates openly on the internet, and when sharing it in a cloud service set the permission to “view only”; made-up data can be used for practice too.