Answer:
its the total row. All you are required to do is to do is to type the = sign, and all the aggregate functions will be listed in a drop down automatically. You can select any one of them. And this list contains all the aggregate functions. You can get this in any row, and in fact any cell. Nothing else is required.
Data series is used for preparing the charts.
A lot of excel templates are available, and that carries exact like a website template.
Title is used to define columns in a table.
Hence, the above answer.
Explanation:
The answer does not require any further explanation.