#include<bits/stdc++.h>
using namespace std;
#define ERROR ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); fileIO();
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
void fileIO(){
    #ifndef ONLINE_JUDGE
    freopen("io\\input.txt", "r", stdin);
    freopen("io\\output.txt", "w", stdout);
    #endif
}

const ll mod = 1e9 + 7, N = 2e5 + 5;

void TestCase(){
    
    int n, k, x, sum = 0;
    cin >> n >> k;

    for(int i = 0; i < k; i++)
        cin >> x, sum += x;
    
    cout << fixed << setprecision(8) << ld(sum - 3 * (n-k)) / ld(n) << ' ' << ld(sum + 3 * (n-k)) / ld(n) << '\n';
    
}

int main() {
    
    ERROR;

    int t = 1;
    //cin >> t;

    while(t--)
        TestCase();

}