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代码：
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
inline int Rint() {int x; scanf("%d", &x); return x;}
inline double Rd() {double x; scanf("%lf", &x); return x;}
int n;
#define MAXN 502
double a[MAXN];
int main()
{
int t=Rint();
while(t--)
{
n = Rint();
for(int i=0; i<n; i++)
a[i] = Rd();
sort(a, a+n);
if(n%2)
{
double t = floor(a[n/2]*1000+0.5)/1000;
printf("%.3lf/n", t);
}
else
{
double t = (a[n/2]+a[n/2-1])/2;
t = floor(t*1000+0.5)/1000;
printf("%.3lf/n", t);
}
}
}
