백준 1546번 자바 - 평균

 

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);

        int N = scanner.nextInt();
        double[] arr = new double[N];

        for (int i = 0; i < N; i++) {
            arr[i] = scanner.nextDouble();
        }
        Arrays.sort(arr);

        double sum = 0;
        for (int i = 0; i < N; i++) {
            sum += (arr[i] / arr[N-1] *100);
        }
        System.out.println(sum / N);
    }
}