백준(1546) JAVA - 평균

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		
		int[] ar = new int[N];
		
		int maxScore = 0;
		float sum = 0;
		float avr = 0;
		
		for(int i = 0 ; i < N ; i++) {
			ar[i] = sc.nextInt();
			
			if(maxScore < ar[i]) {
				maxScore = ar[i];
			}
		}
		
		for(int i = 0 ; i < N ; i++) {
			float tmp = (float) (ar[i] * 100) / maxScore ;
			sum += tmp;
		}
		avr = sum / N;
		System.out.printf("%f", avr);
	}

}