#include <stdio.h>
int main(){
int t, n, m,i, j;
float average;
int score[100][100],max[100],min[100];
scanf("%d", &t);
while(t--){
scanf("%d%d", &n, &m);
for(i = 0; i < m; i++){
max[i] = 0;
min[i] = 100;
}
for(i = 0; i < n; i++){
for(j = 0; j < m; j++){
scanf("%d", &score[i][j]);
if(score[i][j] > max[j])
max[j] = score[i][j];
if(score[i][j] < min[j])
min[j] = score[i][j];
}
}
for(j = 0; j < m; j++){
average = 0;
for(i = 0; i < n; i++)
average += score[i][j];
average = (average - max[j] - min[j]) / (n - 2);
printf("%.2f\n", average);
}
}
return 0;
}
