Add a Total row to a table - Microsoft Support
https://support.microsoft.com/en-us/office/add-a-total-row-to-a-table-9885a56c-51b5-487a-a168-054afd034631
WebSelect Design > Total Row. The Total row is added to the bottom of the table. Note: To add a new row, uncheck the Total Row checkbox, add the row, and then recheck the Total Row checkbox. From the total row drop-down, you can select a function, like Average, Count, Count Numbers, Max, Min, Sum, StdDev, Var, and more. Want more? Insert a total row.
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