uses crt;
var a:array[1..100]of real;
n,i:integer;
tb:real;
begin
clrscr;
write('Nhap so ban:'); readln(n);
for i:=1 to n do
begin
write('Diem cua ban thu ',i,' la: '); readln(a[i]);
end;
tb:=0;
for i:=1 to n do
tb:=tb+a[i];
writeln('Diem trung binh cua cac ban la: ',tb/n:4:2);
readln;
end.