Total sum/average of random numbers in c#

I am new to programming and i would be delighted if someone could help me with the following question: "Write a program that randomly selects integers whose values range from 0 to 9. The program will calculate the average of the random numbers and print how many of the random numbers are larger than the average. The program's user will specify how many numbers will be randomly generated". How do you get the total sum of random numbers so you can get the average? This is what i got so far:

        int ChosenRandom;

        Console.Write("Choose a number between 0-10; ");  

        ChosenRandom = int.Parse(Console.ReadLine()); 

        Random rnd = new Random();

        int RandomNumber = rnd.Next(0, 10);

        for (int i = 0; i < ChosenRandom; i++)

        {
            Console.WriteLine("Random numbers: " + rnd.Next(0, 10));
        }

        int TotalRandom;

        TotalRandom = ChosenRandom + (RandomNumber); 

        Console.WriteLine("Total is:" + TotalRandom);

        int avr;

        avr = TotalRandom / ChosenRandom;     

        Console.WriteLine("Average is: " + avr);

        if (ChosenRandom > avr)    
        {
            Console.WriteLine("Numbers larger than average" + ChosenRandom);
        }

        else   
        {
            Console.WriteLine("All numbers under average");
        }
    }
}

}