#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <math.h>
 
 #define N     50
 
 int main(void)
 {
 	int sum,m,n,x,i,j;
 	double ave;
 	sum=0;
 	ave=0;
 	x=0;
 	n=0;
 	m=0;
 	
 	scanf("%d",&m);
 	
 	for (i=0;i<m;i++){
 	    scanf("%d",&n);
 			for (j=0;j<n;j++){
 		    scanf("%d",&x);
 		    sum=x+sum;
 		    ave=(double)sum/n;
 	    }
 		printf("¹ç·×%dÊ¿¶Ñ%.2f\n",sum,ave);
 		sum=0;
 		ave=0;
 	}
 }