Median
#include <stdio.h>
#include<cmath>
#include<algorithm>
#include<cstring>
#define MAXN 502
int main()
{
double a[101];
int i,j,k;
double r;
scanf("%d",&i);
while(i--){
scanf("%d",&j);
for(i=0;i<j;i++){
scanf("%lf",&a[i]);
}
sort(a,a+j);
if(j%2){ r=floor(a[j/2]*1000+0.5)/1000;
printf("%.3lf\n",r);
}
else{
r=(a[j/2]+a[j/2-1])/2;
r=floor(r*1000+0.5)/1000;
printf("%.3lf\n",r);}
}
return 0;
}