program Giai;
uses crt;
var a:array[1..100] of real;
n,i:longint;
tong:real;
begin
clrscr;
write('So phan tu cua day n: ');readln(n);
for i:=1 to n do
begin
write('Nhap phan tu a[',i,']: ');
readln(a[i]);
end;
tong:=0;
for i:=1 to n do
begin
tong:=tong+a[i];
end;
writeln('TBC cua ',n,' phan tu la: ',tong/n:2:2);
readln;
end.