#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

#define el '\n'
#define FIO ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned uint;
typedef __int128 bint;
typedef long double ld;
typedef complex<ld> pt;
typedef unsigned long long ull;

template<typename T, typename X>
using hashTable = gp_hash_table<T, X>;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

// mt19937_64 for unsigned long long
mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());

void doWork()
{
    int n, k;
    cin >> n >> k;

    int s = 0;
    for(int i = 0, in; i < k; i++)
        cin >> in, s += in;

    ld mx = (ld) (s + (n - k) * 3) / (ld) n;
    ld mn = (ld) (s + (n - k) * -3) / (ld) n;

    cout << mn << ' ' << mx;


}

signed main()
{
    FIO
    int T = 1;
//    cin >> T;
    for(int i = 1; i <= T; i++)
        doWork();
}