题解 | #求平均年龄#

#include<stdio.h>
int main(){
	int n;
	while (scanf("%d", &n) != EOF){
		float sum = 0;
		for (int i = 0; i < n; i++){
			int p;
			scanf("%d", &p);
			sum = sum + p;
		}
		printf("%.2f\n", sum/n);
	}
}