# Seq.average<^T> Function (F#)

Visual Studio 2010

Returns the average of the elements in the sequence.

Namespace/Module Path: Microsoft.FSharp.Collections.Seq

Assembly: FSharp.Core (in FSharp.Core.dll)

```// Signature:
Seq.average : seq<^T> -> ^T (requires ^T with static member (+) and ^T with static member DivideByInt and ^T with static member Zero)

// Usage:
Seq.average source
```

## Parameters

source

Type: seq<^T>

The input sequence.

## Exceptions

Exception

Condition

ArgumentException

Thrown when the input sequence has zero elements.

ArgumentNullException

Thrown when the input sequence is null.

## Return Value

The result sequence.

## Remarks

The elements are averaged using the + operator, DivideByInt method and Zero property associated with the element type.

This function cannot be used directly on a sequence of integers since it requires that the type support an exact division operation, which is indicated by the constraint that the element type must support DivideByInt.

This function is named Average in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.

## Example

The following code example shows how to use Seq.average, and also compares Seq.average with Seq.averageBy.

```
// You can use Seq.average to average elements of a list, array, or sequence.
let average1 = Seq.average [ 1.0 .. 10.0 ]
printfn "Average: %f" average1
// To average a sequence of integers, use Seq.averageBy to convert to float.
let average2 = Seq.averageBy (fun elem -> float elem) (seq { 1 .. 10 })
printfn "Average: %f" average2

```

Output

```Average: 5.500000
Average: 5.500000

```

## Platforms

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

## Version Information

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

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