Average

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        decimal[] numbers = { 3, 4, 8 };
        decimal average = numbers.Average();  // 5  (mean value)

        Console.WriteLine(average);

        double avg = new int[] { 3, 4 }.Average();  // 3.5
        Console.WriteLine(avg);

    }
}