freepascal.compiler/docs/mathex/ex28.pp

Program Example28;

{ Program to demonstrate the Meanandstddev function. }

Uses math;

Type
  TExArray = Array[1..100] of Extended;
    
Var
  I : Integer;
  ExArray : TExArray; 
  Mean,stddev : Extended;
    
begin
  Randomize;
  for I:=1 to 100 do 
    ExArray[i]:=(Random-Random)*100;
  MeanAndStdDev(ExArray,Mean,StdDev);
  Writeln('Mean       : ',Mean:8:4);  
  Writeln('StdDev     : ',StdDev:8:4);  
  MeanAndStdDev(@ExArray[1],100,Mean,StdDev);
  Writeln('Mean   (b) : ',Mean:8:4);  
  Writeln('StdDev (b) : ',StdDev:8:4);  
end.