import java.util.Scanner;

class Mar9 {
	public static void main(String[] args) {

		Scanner kb = new Scanner(System.in);

		System.out.print("Enter number of scores: ");
		int len = kb.nextInt();

		int[] scores = new int[len];

		// get first element in array
		int firstElement = scores[0];
		System.out.printf("first: %d\n", firstElement);

		// get length of the array
		System.out.printf("length of array: %d\n", scores.length);

		printArray(scores);

		// populate the array
		for(int i = 0; i < scores.length; i++) {
			System.out.print("Enter score: ");
			int score = kb.nextInt();

			scores[i] = score;
		}

		printArray(scores);

		// compute mean average

		int sum = 0;
		for(int i = 0; i < scores.length; i++) {
			sum = sum + scores[i];
		}

		System.out.printf("sum: %d\n", sum);

		double mean = sum / (double) scores.length;

		System.out.printf("mean: %.2f\n", mean);
	}

	static void printArray(int[] arr) {
		for(int i = 0; i < arr.length; i++) {
			System.out.printf("%d%s", arr[i], (i < arr.length -1) ? "," : "");
		}
		System.out.println();
	}
}