program trungbinhcong;

uses crt;
var n,i:integer;
      KQ,x: real;
begin
clrscr;
write(' N = '); readln(n);
i:=0; KQ:=0;
while i < n do
begin
i:=i+1;
write('Nhap x ',i,' = '); readln(x);
KQ:=KQ+x;
end;
writeLN('Trung binh ',n,' so thuc la: ',KQ/n:0:2);
readln;
end.

program mang;

uses crt;

var X:array [1..500] of real;

      n,i: integer;

      T: real;

Begin

         clrscr;

         write('Nhap so phan tu: '); readln(n);

         for i:=1 to n do

         begin 

                  write('X[',i,']='); readln(X[i]);

                  T:=T+X[i];

         end;

         write('Trung binh cong cac so thuc = ',T/n:2:2);

         readln

End.