using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("we need to make an array 3D");

        //Console.WriteLine("===========================");

    //  Console.WriteLine("        ");

        //Console.WriteLine("enter the number of first dimension:");

//int n=int.Parse(Console.ReadLine());

        //Console.WriteLine("===========================");

        //Console.WriteLine("enter the number of second dimenstion:");

        //int m=int.Parse(Console.ReadLine());

        //Console.WriteLine("===========================");

    //  Console.WriteLine("enter the number of third dimension:");

    //  int b=int.Parse(Console.ReadLine());

        //Console.WriteLine("===========================");

    //  int [,,]arr =new int[n ,m,b];

        //Console.WriteLine("please enter the element of array");

        //for(int i=0;i<arr.GetLength(0);i++)

        //{

            //for(int j=0;j<arr.GetLength(1);j++)

        //{

            //for(int k=0;k<arr.GetLength(2);k++)

        //{

            //arr[i,j,k]=int.Parse(Console.ReadLine());

        //}

        //}

        //}

        //Console.WriteLine("===========================");

        //Console.WriteLine("===========================");

        //for(int i=0;i<arr.GetLength(0);i++)

        //{

            //for(int j=0;j<arr.GetLength(1);j++)

        //{

            //for(int k=0;k<arr.GetLength(2);k++)

    //  {

        //Console.Write(arr[i,j,k]+" ");

        //}

        //}

        //}

        /* Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&7&&&&&&&&&&&&&&&&");

        Console.WriteLine("we need to make TWO array 1D  AND put the sum of two array in tge third array");

        Console.WriteLine("===========================");

        Console.WriteLine("        ");

        Console.WriteLine(" the number elment in two array are  :");

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

        int []arr1=new int [n];

        Console.WriteLine(" the element of first array are");

        for(int i=0;i<arr1.Length;i++)

        {

            arr1[i]=int.Parse(Console.ReadLine());

        }

        Console.WriteLine("===========================");

        Console.WriteLine("===========================");

        int []arr2=new int [n];

        Console.WriteLine(" the element of second array are");

        for(int i=0;i<arr2.Length;i++)

        {

            arr2[i]=int.Parse(Console.ReadLine());

        }

        Console.WriteLine("===========================");

        Console.WriteLine("===========================");

        Console.WriteLine("the result of sum two array are:");

        int[]result =new int[n]; 

        for (int i=0;i<result.Length;i++)

        {

            result[i]= arr1[i]+arr2[i];

            Console.Write("   "+ result[i]+"   ");  

        }*/

        /* Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&7&&&&&&&&&&&&&&&&");

        Console.WriteLine(" this project to compare between two array and know if they are equal or not");

        Console.WriteLine("------------------------------------------------------");

        Console.WriteLine(" enter the length of first array ");

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

        int []arr1=new int [n];

        Console.WriteLine(" the element of first array are");

        for ( int i=0 ;i<arr1.Length;i++)

        {

            arr1[i]=int.Parse( Console.ReadLine());

        }

            Console.WriteLine("------------------------------------------------------");

        Console.WriteLine(" enter the length of second array ");

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

        int []arr2=new int [b];

        Console.WriteLine(" the element of second array are");

        for ( int i=0 ;i<arr2.Length;i++)

        {

            arr2[i]=int.Parse( Console.ReadLine());

        }

        int count =0;

        if (arr1.Length != arr2.Length)

        {

            Console.WriteLine(" the two arra are not equal");

        }

        else 

        {

            for(int i =0 ;i<arr1.Length ;i++)

            {

                count ++;

            }

        }

        if (count==arr2.Length)

        {

            Console.WriteLine(" THE ARAAYS ARE EQUAL");

        }

        else 

        {

            Console.WriteLine(" THE ARAAYS ARE not  EQUAL");

        }*/

     /*   Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&7&&&&&&&&&&&&&&&&");

        Console.WriteLine("------------------------------------------------------");

        Console.WriteLine( " the length of array  is :");

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

        int[]arr =new int[n];

        Console.WriteLine(" the element of array is ");

        sum(arr);

    }

    static void sum(  int []arr)

    {

        int sum =0;

        for ( int i=0 ;i<arr.Length;i++)

        {

            arr[i]=int.Parse(Console.ReadLine());

            sum +=arr[i];

        }

        Console.Write(" the sum of array is : "+sum);*/

        Console.WriteLine("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&7&&&&&&&&&&&&&&&&");

        Console.WriteLine("------------------------------------------------------");

        Console.WriteLine("enter the length of array");

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

        int[]arr=new int[n];

        Console.WriteLine("the element of array are:");

        for (int i=0;i<arr.Length;i++)

        {

            arr[i]=int.Parse(Console.ReadLine());

        }

        double a =mean(arr);

        double b=standard(arr,a);

        output(arr,a,b);

    }

    static double mean( int[]arr)

    {

        double sum =0;

        for (int i=0;i<arr.Length;i++)

        {

            sum += arr[i];

        }

        double mean =sum/arr.Length;

        return(mean);

    }

    static double standard( int[]arr,double mean)

    {

        double w=0;

        for (int i=0;i<arr.Length;i++)

        {

            w += Math.Pow((arr[i]-mean),2);

        }

        double s=Math.Sqrt(w/arr.Length-1);

        return(s);

    }

    static void output(int[]arr,double mean ,double s)

    {

        for (int i=0;i<arr.Length;i++)

        {

            Console.WriteLine("  " +arr[i]);

        }

        Console.WriteLine("the averege is :"+mean);

        Console.WriteLine("the standard deviation is :"+s);

    }

}