> For the complete documentation index, see [llms.txt](https://soufatn.gitbook.io/rxjs-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://soufatn.gitbook.io/rxjs-book/summary/observable/observable_instance_methods/average.md).

# average

Computes the average of an observable sequence of values that are in the sequence or obtained by invoking a transform function on each element of the input sequence if present.

## Arguments

1. `[selector]` *(`Function`)*: A transform function to apply to each element.
2. `[thisArg]` *(`Any`)*: Object to use as `this` when executing `selector`.

## Returns

*(`Observable`)*: An observable sequence containing a single element with the average of the sequence of values.

## Example

### Without a selector

### With a selector