#include <bits/stdc++.h>
using namespace std;
int main () {
int x;
cin>>x;
for(int i=0;i<x;i++) {
float t=0;int k,n;
cin>>n>>k;
int a[n];
for(int j=0;j<n;j++)
{
cin>>a[j];
}
sort(a,a+n);
for(int j=k;j<n-k;j++){
t=t+a[j];
}
// cout<<t/(n-(2*k))<<endl;
printf("%f\n",t/(n-(2*k)));
}
}
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