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secure
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secure
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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define ld long double
#define MAX 200010
#define MOD 1000000007
#define INF 1e15
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pi 3.14159265358979323846
#define endl "\n"
#define coutflg if(flg){cout << "YES\n";}else{cout << "NO\n";}
#define coutyes cout << "YES\n";
#define coutno cout << "NO\n";
#define flush fflush(stdout);
#define fixedprec cout << fixed << setprecision(18);
void solve(){
fixedprec
ll n;
cin >> n;
ll a[n];
for(ll i=0;i<n;i++){
cin >> a[i];
}
sort(a,a+n);
ll sum = 0;
for(ll i=0;i<n-1;i++){
sum += a[i];
}
ld ans = (ld)sum/(ld)(n-1);
ans += (ld)a[n-1];
cout << ans << endl;
}
int main(){
#ifndef ONLINE_JUDGE
// for getting input from input.txt
freopen("input.txt", "r", stdin);
// for writing output to output.txt
// freopen("output.txt", "w", stdout);
#endif
fast
ll t,q;
q = 1;
cin >> q;
for(t=1;t<=q;t++){
// cout << "Case #" << t << ": ";
solve();
}
}