#include <iostream>
#include <cstdio>
#include <algorithm>
#include <iomanip>
using namespace std;

int t, n, k, i, j;
double s, a[10100];

int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    ios_base::sync_with_stdio(0);
    cout.precision(7);
    cin >> t;
    for (int i = 1; i <= t; i++)
    {
        cin >> n >> k; s = 0;
        for (int j = 1; j <= n; j++) cin >> a[j];
        sort(a + 1, a + n + 1);
        for (int j = k + 1; j <= n - k; j++) s += a[j];
        cout << fixed << 1.0 * s / (n - k - k) << "\n";
    }
    return 0;
}