RMS of an array

Problem Statement

Given an array A of size N. You need to find the root mean square (RMS) of the array i. e you first need to square all values of array and take its mean. Then you need to return the square root of mean. Print the answer with precision upto 6 decimal places.

 import java.io.*; // for handling input/output

import java.util.*; // contains Collections framework

// don't change the name of this class

// you can add inner classes if needed

class Main {

public static void main(String args[])

{

    Scanner sc= new Scanner(System.in);

    int n= sc.nextInt();

    int a[]=new int[n];

   double rms=0;

   double sum=0;

    for (int i=0;i<n;i++)

    {

        a[i]=sc.nextInt();

        sum=sum+a[i]*a[i];

    }

    double ans =sum/n;

    rms=rms+Math.sqrt(ans);

    System.out.format("%.6f", rms);

}

}