#include <bits/stdc++.h>

typedef long long ll;
typedef long double ld;
using namespace std;
#define Mohab ios_base::sync_with_stdio(false); cin.tie(nullptr);
#define el '\n'

void RRR() {
    ll n, k;
    cin >> n >> k;

    ll d = n - k;

    ld mx = 0, mn = 0;

    for (ll i = 0; i < k; i++) {
        ll x;
        cin >> x;

        mn += x;
        mx += x;
    }

    mn += 1.0*(-3.0*d);
    mx += 1.0*(3.0*d);

    mn /= n;
    mx /= n;

    cout << fixed << setprecision(5) << mn << ' ' << mx;


}

signed main() {
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    Mohab
    int T = 1;
//    cin >> T;
    while (T--)
        RRR();
}