dep trai dang cap vu tru

include <iostream>

include <iomanip>

using namespace std; int main() { int n; cin >> n; double nguhoc = 0; for (int i = 0; i < n; i++) { double x; cin >> x; nguhoc += x; } double nigger = nguhoc / n; cout << fixed << setprecision(3) << nigger; return 0; }