Сума и средноаритметично

using System;
using System.Collections.Generic;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> list = new List<int> { 3, 4, 5, 6 };
            Console.WriteLine(Sum(list));
            Console.WriteLine(Average(list));





        }

        public static int Sum( List<int> list)
        {
            int sum = 0;
            foreach(int number in list)
            {
                sum += number;
            }

            return sum;

        }


        public static double Average(List<int> list)
        {
            return Sum(list) * 1.0 / list.Count;
        }




    }
}