public static void Main()
Console.WriteLine("Enter Number");
n = int.Parse(Console.ReadLine());
double[] arr = new double[n];
double sum=0,deviation=0;
Console.WriteLine(" Enter no "+ (i+1) );
arr[i] = int.Parse(Console.ReadLine());
arr[i] = Math.Pow((arr[i] - sum),2);
Console.WriteLine(" Variation is " + (deviation/n));
deviation = Math.Sqrt(deviation/n);
Console.WriteLine(" Standard Deviation is " + deviation);