Excel Essentials: Using the SUM Function to Sum Numbers in a Range with Ease
How to Use the SUM Function for Quick Calculations in Excel
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The SUM function adds up all the numbers in a specified range of cells.

How to Use the AVERAGE Function for Quick Calculations in Excel
How to Use the AVERAGE Function in Excel
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The AVERAGE function calculates the arithmetic mean of its arguments, which can be numbers, names, arrays, or references that contain numbers.