using System;

public class Program
{
    public static void Main()
    {
        int n = Int32.Parse(Console.ReadLine());
        int[] arr = new int[n];
        int sum = 0;

        for (int i = 0; i < n; i++)
        {
            int num = Int32.Parse(Console.ReadLine());
            arr[i] = num;
            sum += num;
        }

        double avrg = (sum * 1.0) / n;
        double avrgSum = avrg;
        if (n > 1)
        {
            avrgSum += ((arr[1] + arr[n - 2]) * 1.0) / 2;
        }

        Console.WriteLine(avrg);
        Console.WriteLine(avrgSum);
    }
}