What is the use of AVERAGEIF function?

AVERAGEIF Function in Excel find the Average of all numbers in a range based on a given criteria

What is the syntax of AVERAGEIF function?

AVERAGEIF Function in Excel - Syntax

AVERAGEIF( range, criteria,

[average_range] )

range: range of cells that you want to check the criteria
criteria: condition which you want to apply
[average_range]: range of cells to find average based on criteria, if it is missing it will consider the first rang as average_range

AVERAGEIF Function in Excel – Examples

AVERAGEIF Function in Excel - Example 1
Example 1: finding Average of the salaries more than 2500
Example 2: finding Average of all Salries of HR Department
Example 3: finding Average of all Salries of Year 2012
Example 4: finding Average of all Salries of Year 2012
Example 5: finding Average of all Salries of Admin Department

Reference:

Please refer the below article for more Statistical Excel functions.
Statistical Excel Formulas

Please refer the below article for more Excel Functions.
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