# average

[Built-ins](README.md) · [Labs guide](../guides/labs.md)

Canonical ID: `math.mean`. Nederlands: `gemiddelde`.

Calculates the arithmetic mean of a List of finite Numbers.

## Signature

```text
average(numbers)
```

## Return value and behavior

Number; an empty List returns none.

Numeric lists contain at most 4096 finite Numbers; invalid items are rejected.

## Example

```pliro
# language: en
say average([2, 4])
```