提交记录

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    vector<int> age(n);
    for (int i = 0; i <= n; i++)
    {
        cin >> age[i];
    }

    double p;
    for (int i = 0; i <= n; i++)
    {
        p += age[i];
    }
    p /= n;
    printf("%.2f", p);
    return 0;
}