[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'Math' (#rtl)

# Mean

Return mean value of array

## Declaration

Source position: math.pp line 423

 function Mean( const data: array of Single ):Float;function Mean( const data: PSingle; const N: LongInt ):Float;function Mean( const data: array of Double ):Float;function Mean( const data: PDouble; const N: LongInt ):Float;function Mean( const data: array of Extended ):Float;function Mean( const data: PExtended; const N: LongInt ):Float;function Mean( const data: PInt64; const N: LongInt ):Float;function Mean( const data: array of Int64 ):Float;function Mean( const data: PInteger; const N: LongInt ):Float;function Mean( const data: array of Integer ):Float;

## Description

Mean returns the average value of data. The second form accepts a pointer to an array of N values.

## Errors

None.

 meanandstddev Return mean and standard deviation of array momentskewkurtosis Return 4 first moments of distribution sum Return sum of values

## Example

```Program Example27;

{ Program to demonstrate the Mean function. }
{ @ should return typed pointer }
{\$T+}
Uses math;

Type
TExArray = Array[1..100] of Float;

Var
I : Integer;
ExArray : TExArray;

begin
Randomize;
for I:=low(ExArray) to high(ExArray) do
ExArray[i]:=(Random-Random)*100;
Writeln('Max      : ',MaxValue(ExArray):8:4);
Writeln('Min      : ',MinValue(ExArray):8:4);
Writeln('Mean     : ',Mean(ExArray):8:4);
Writeln('Mean (b) : ',Mean(PExtended(@ExArray[1]),100):8:4);
end.
```