#include <iostream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <string>
#include <cstring>
#include <queue>
#define rf freopen("in.in", "r", stdin)
#define wf freopen("out.out", "w", stdout)
#define rep(i, s, n) for(int i=int(s); i<=int(n); ++i)
using namespace std;
const int mx = 1e5 + 10, mod = 1e9+7;

double input[mx];
int n, t, k;

int main()
{
	//rf;// wf;
	ios::sync_with_stdio(0);

	cin >> t;
	while(t--)
	{
		cin >> n >> k;
		rep(i, 1, n)
			cin >> input[i];

		sort(input+1, input+n+1);
		
		long double ans = 0;
		rep(i, k+1, n-k)
			ans += input[i];

		ans /= (n-2*k);
		printf("%.7Lf\n", ans);
	}
	return 0;
}