[NumLock]

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  s: string;
  i: Integer;
  f: Real;
  f1, f2: Real;
  n: Integer;
begin
  DecimalSeparator:='.';
  f1:=StrToFloat(Edit2.Text);
  f2:=StrToFloat(Edit3.Text);
  n:=0;
  s:=Edit1.Text;
  while s<>'' do
  begin
    i:=Pos(' ', s);
    if i>0 then
    begin
      f:=StrToFloat(Trim(Copy(s, 1, i)));
      s:=Trim(Copy(s, i, Length(s)));
    end else
    begin
      f:=StrToFloat(s);
      s:='';
    end;
    if (f>=f1) and (f<=f2) then Inc(n);
  end;
  Edit4.Text:=IntToStr(n);
end;

end.

изначально:
Edit1 = 9.72 11.68 7.57 6.28 4.91 5.50
Edit2 = 4.90
Edit3 = 5.90
Edit4 = пятница