#include <bits/stdc++.h>

#define el '\n'
#define ll long long
#define ld long double

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

using namespace std;

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

    int sum = 0;

    for (int i = 0, a; i < k; i++)
        cin >> a, sum += a;

    int mx = sum + (n - k) * 3;
    int mn = sum + (n - k) * -3;

    cout << fixed << setprecision(5) << (ld)mn / n << ' ' << (ld)mx / n;
}

signed main() {
    Beevo

    int T = 1;
//    cin >> T;

    while (T--)
        testCase();

    return 0;
}