SumMinFirstLastAverage - Methods

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Array___SumMinMaxFirstLastAverage
{
    class SumMinMaxFirstLastAverage
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int[] numbers = new int[n];
            for (int i = 0; i < numbers.Length; i++)
            {
                numbers[i] = int.Parse(Console.ReadLine());
            }

            Console.WriteLine(Sum(numbers));
            Console.WriteLine(Min(numbers));
            Console.WriteLine(Max(numbers));
            Console.WriteLine(First(numbers));
            Console.WriteLine(Last(numbers));
            Console.WriteLine(Average(numbers));
        }
        public static int Sum(int[] ArrSum)
        {
            int sum = 0;
            for (int i = 0; i < ArrSum.Length; i++)
            {
                sum += ArrSum[i];
            }

            return sum;
        }
        public static int Min(int[] ArrMin)
        {
            int minNumber = ArrMin[0];
            for (int i = 0; i < ArrMin.Length; i++)
            {
                if(ArrMin[i] < minNumber)
                {
                    minNumber = ArrMin[i];
                }
            }
            return minNumber;
        }
        public static int Max(int[] ArrMax)
        {
            int maxNumber = ArrMax[0];
            for (int i = 0; i < ArrMax.Length; i++)
            {
                if(ArrMax[i] > maxNumber)
                {
                    maxNumber = ArrMax[i];
                }
            }
            return maxNumber;
        }
        public static int First(int[] ArrFirst)
        {
            int firstNumber = ArrFirst[0];
            return firstNumber;
        }
        public static int Last(int[] ArrLast)
        {
            int lastNumber = ArrLast[ArrLast.Length - 1];
            return lastNumber;
        }
        public static double Average(int[] ArrAverage)
        {
            int elements = Sum(ArrAverage);
            return (double)elements / ArrAverage.Length;
        }


    }
}