using System;

using A=System.Console;

public class Program

{

    static void StandardandMean(int[]a)

    {

        int i=0;

        int sum=0;

        int numbers=a.Length;

        for(i=0;i<numbers;i++)

        {

            sum=sum+a[i];

        }

        double mean=(double)sum/numbers;

        A.WriteLine("Mean is: " + mean);

        double sod=0;

        for(i=0;i<numbers;i++)

        {

            sod=sod+((a[i]-mean)*(a[i]-mean));

        }

        double variance_sqr=sod/numbers;

        double std_deviation=Math.Sqrt(variance_sqr);

        A.WriteLine("Standard Deviation is: "+ std_deviation);

    }

    public static void Main()

    {

        int[]a={50,60,10};

        StandardandMean(a);

    }

}