#include <bits/stdc++.h>
using namespace std;

#define zedanov                   \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define ll long long
#define el "\n"

void doWork()
{
    int n, k;
    cin >> n >> k;
    double sum = 0;
    for (int i = 0, x; i < k; i++)
    {
        cin >> x;
        sum += x;
    }
    double rem = n - k;
    cout << (sum + (-3 * rem)) / n << " " << (sum + (3 * rem)) / n;
}

signed main()
{
    zedanov int t = 1;
    // cin >> t;
    while (t--)
        doWork();

    return 0;
}