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C# - Add number to the end of list for each item

Using C#, in the example below, how can I add a number to the end of a list for each of the items?

For example, a random number should be added to the list of Lucky Numbers for each Cat.

using System;
using System.Linq;
using cAlgo.API;
using System.Collections.Generic;

namespace cAlgo.Robots
{
    [Robot()]
    public class DemoExample : Robot
    {
        List<Cat> myCats = new List<Cat> 
        {
            new Cat 
            {
                Name = "Sylvester",
                Age = 8,
                LuckyNumbers = {1,2,3}
            },
            new Cat 
            {
                Name = "Whiskers",
                Age = 2,
                LuckyNumbers = {4,5,6}

            },
            new Cat 
            {
                Name = "Sasha",
                Age = 13,
                LuckyNumbers = {7,8,9}
            }
        };

        protected override void OnTick()
        {

                Print("---------------");
                Random rnd = new Random();
                foreach(Cat theCat in myCats)
                {
                  Print("The average of all the lucky numbers for {0} is : {1} ", theCat.Name, theCat.LuckyNumbers.Average());
                  // Add a luck number for the cat here -- Math.Round(rnd.NextDouble() * 50)  

                }

        }

    }
}

public class Cat
{
    public string Name { get; set; }
    public int Age { get; set; }
    public List<double> LuckyNumbers = new List<double>();
}

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SOLUTION