Finds the average (arithmetic mean) for the cells specified by a given condition or criteria.
| Name | Type | Description |
| arg1 | ApiRange | The range of cells which will be evaluated. |
| arg2 | number | string | The condition or criteria in the form of a number, expression, or text that defines which cells will be used to find the average. |
| arg3 | ApiRange | The actual cells to be used to find the average. If omitted, the cells in the range are used. |