Average Method (IEnumerable(Decimal))

# Enumerable.Average Method (IEnumerable<Decimal>)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Computes the average of a sequence of Decimal values.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

## Syntax

```public static decimal Average(
this IEnumerable<decimal> source
)
```

#### Parameters

source
Type: System.Collections.Generic.IEnumerable<Decimal>
A sequence of Decimal values to calculate the average of.

#### Return Value

Type: System.Decimal
The average of the sequence of values.

#### Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<Decimal>. When you use instance method syntax to call this method, omit the first parameter.

## Exceptions

ExceptionCondition
ArgumentNullException

source is null.

InvalidOperationException

source contains no elements.

## Remarks

In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Enumerable.Average.

## Examples

The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate the average of a sequence of values.

Note:

This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

```
List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.Average();

outputBlock.Text += String.Format("The average grade is {0}.", average) + "\n";

// This code produces the following output:
//
// The average grade is 77.6.

```

## Version Information

#### Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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