C# Calculate Root Mean Square

using System;

class RootMeanSquare {

    // Entry Point
    public static void Main()
    {
        int[] arr = { 20, 8, 12, 16 };

        int n = arr.Length;

        Console.Write(RMS_Value(arr, n));

        Console.Read();

    }

    // Root Mean Square  
    static float RMS_Value(int[] arr, int n)
        {
            int square = 0;
            float mean, root = 0;            

            // Calculate square
            for (int i = 0; i < n; i++)
            {
                square += (int)Math.Pow(arr[i], 2);
            }

            // Calculate Mean
            mean = (square / (float)(n));

            // Calculate Root
            root = (float)Math.Sqrt(mean);

            return root;
        }
      
    }

 

Output