#include<stdio.h>#include<math.h>int main(){int i;scanf("%d",&amp;i);for(;i>0;i--){int n;int max,min;scanf("%d",&amp;n);int ray[n];float fcx,sum;for(int j=0;j<n;j++){scanf("%d",&amp;ray[j]);}max=ray[0];min=ray[0];for(int j=0;j<n;j++){if(ray[j]>max) max=ray[j];if(ray[j]<min) min=ray[j];sum=sum+ray[j];}sum=sum/n;for(int j=0;j<n;j++){fcx+=pow(ray[j]-sum,2);}float x=fcx/n;printf("%d %.3f\n",max-min,x);}return 0;}
