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Microsoft Excel  Calculate the average of a group of numbers
Let's say you want to find the average number of days to complete a milestone in a project or the average temperature on a particular day over a 10year time span. There are several ways to calculate the average of a group of numbers.
Average which is the arithmetic mean, and is calculated by adding a group of numbers and then dividing by the count of those numbers. For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5.
Median which is the middle number of a group of numbers; that is, half the numbers have values that are greater than the median, and half the numbers have values that are less than the median. For example, the median of 2, 3, 3, 5, 7, and 10 is 4.
Mode which is the most frequently occurring number in a group of numbers. For example, the mode of 2, 3, 3, 5, 7, and 10 is 3.
For a symmetrical distribution of a group of numbers, these three measures of central tendency are all the same. For a skewed distribution of a group of numbers, they can be different.
Calculate the average of numbers in a contiguous row or column
Click a cell below or to the right of the numbers for which you want to find the average.
On the Home tab, in the Editing group, click the arrow next to AutoSum , click Average, and then press ENTER.
Calculate the average of numbers not in a contiguous row or column
To do this task, use the AVERAGE function.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example
Create a blank workbook or worksheet.
Select the example in the Help topic.
Note: Do not select the row or column headersSelecting an example from Help
Press CTRL+C.
In the worksheet, select cell A1, and press CTRL+V.
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.


Calculate a weighted average
To do this task, use the SUMPRODUCT and SUM functions.
Example
The example may be easier to understand if you copy it to a blank worksheet.


Calculate the average of numbers, ignoring zero (0) values
To do this task, use the AVERAGE and IF functions.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example
Create a blank workbook or worksheet.
Select the example in the Help topic.
Note: Do not select the row or column headersSelecting an example from Help
Press CTRL+C.
In the worksheet, select cell A1, and press CTRL+V.
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

