100%AC

#include<cstdio>
int main(){
    int n,sum=0,numbers[11];
    scanf("%d\n",&n);
    for(int i=1;i<=n;i++)scanf("%d ",&numbers[i]);
    for(int i=1;i<=n;i++)sum+=numbers[i];
    double av=sum*1./n;
    printf("AV=%.1lf\n",av);
    for(int i=1;i<=n;i++){
        if(numbers[i]>av)printf("%d:%d ",i,numbers[i]);
    }
}