Вычисление ср.арифм. в массиве,нахождение элементов>ср. арифм и присвоение их другому массиву

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, StdCtrls;
type mas = array [1..100] of extended;
type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    StringGrid1: TStringGrid;
    StringGrid2: TStringGrid;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 i,n: integer;
 a:mas;
 
implementation
 
{$R *.dfm}
 
function P ( n: integer ; const a:mas ): extended;
 var
 i,j: integer;
  s,k,r: extended;
  b:mas;
begin
s :=0;j:=0;
 for i :=1 to n do
  s := s + a[i];
  k:=s/n;
 
  for i:=1 to n do
  if a[i]>k then
  begin
  Inc(j);
  b[j]:=a[i];
 
  P:=b[j];
  end;
  end;
procedure TForm1.Button1Click(Sender: TObject);
begin
StringGrid1.ColCount := StrToInt(Edit1.Text) + 1;
 for i := 1 to StrToInt(Edit1.Text) do
  StringGrid1.Cells[i,0] := '1';
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
n := StrToInt(Edit1.Text);
for i := 1 to n do begin
 
a[i] := StrToFloat(StringGrid1.Cells[i,0]);
 
 StringGrid2.Cells[i,0] := Floattostr(p(n,a));
end;
end;
 
procedure TForm1.FormCreate(Sender: TObject);
begin
Edit1.Text := '3';
 for i := 1 to StrToInt(Edit1.Text) do
  StringGrid1.Cells[i,0] := '1';
end;
 
end.