代码：

#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    double x, v = 0.0000, z = 0.0000;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> x;
        v = v + x;
    }
    z = v / n;
    printf("%.4lf", z);
    return 0;
}