#include <bits/stdc++.h>

using namespace std;

#define int long long
#define ld long double
#define el '\n'
#define fi first
#define se second

#define Nine_seconds ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

void run_case(int tc) {

    int n,k;
    cin >> n >> k;

    double mn = 0, mx = 0;

    for(int i = 0; i < k; i++)
    {
        double x;
        cin >> x;
        mn += x, mx += x;
    }

    cout << fixed << setprecision(4) << (mn + (n - k) * (-3)) / n << ' ' << (mx + (n - k) * 3) / n << '\n';

}


int32_t main() {
    Nine_seconds        /*Turn Off for Interactive Problems*/

    int _t = 1;
    //cin >> _t;
    for (int i = 1; i <= _t; i++) {
        run_case(i);
    }
}