---
title: experimental.mean() function
description: >
  `experimental.mean()` computes the mean or average of non-null values in the `_value` column
  of each input table.
menu:
  flux_v0_ref:
    name: experimental.mean
    parent: experimental
    identifier: experimental/mean
weight: 101
flux/v0/tags: [transformations, aggregates]
introduced: 0.107.0
---

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`experimental.mean()` computes the mean or average of non-null values in the `_value` column
of each input table.

Output tables contain a single row the with the calculated mean in the `_value` column.

##### Function type signature

```js
(<-tables: stream[{A with _value: float}]) => stream[{A with _value: float}]
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Calculate the average value of input tables

```js
import "experimental"
import "sampledata"

sampledata.float()
    |> experimental.mean()

```

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{{% expand "View example input and output" %}}

#### Input data

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t1   | -2.18   |
| 2021-01-01T00:00:10Z | t1   | 10.92   |
| 2021-01-01T00:00:20Z | t1   | 7.35    |
| 2021-01-01T00:00:30Z | t1   | 17.53   |
| 2021-01-01T00:00:40Z | t1   | 15.23   |
| 2021-01-01T00:00:50Z | t1   | 4.43    |

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t2   | 19.85   |
| 2021-01-01T00:00:10Z | t2   | 4.97    |
| 2021-01-01T00:00:20Z | t2   | -3.75   |
| 2021-01-01T00:00:30Z | t2   | 19.77   |
| 2021-01-01T00:00:40Z | t2   | 13.86   |
| 2021-01-01T00:00:50Z | t2   | 1.86    |


#### Output data

| *tag | _value  |
| ---- | ------- |
| t1   | 8.88    |

| *tag | _value            |
| ---- | ----------------- |
| t2   | 9.426666666666668 |

{{% /expand %}}
{{< /expand-wrapper >}}