6.1.6 статически

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>

using namespace std;

int main()
{
    int n, s1;
    cin >> n;
    s1 = 0;
    int a[101];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        s1 += a[i];
    }
    cout << (double)s1 / n << endl;
    int k, m, s2;
    cin >> k >> m;
    s2 = 0;
    int b[101][101];
    for (int i = 0; i < k; i++) {
        for (int j = 0; j < m; j++) {
            cin >> b[i][j];
            s2 += b[i][j];

        }
    }
    cout << (double)s2 / (k * m);
    return 0;
}