Program for Calculating Average of 1000 Grades

Question 39: Program for calculating average of 1000 grades
import java.util.Scanner;
class Calc
{
public static void main (String args[])
{
int i;
double total=0;
double avg;
System.out.println ("How many numbers you want to enter :");
Scanner sc = new Scanner (System.in);
int n= sc.nextInt ();
double [] marks=new double[n];
for (i=0; i<marks.length; i++) {
System.out.println ("Enter the element number "+ (i+1) +": ");
marks [i] = sc.nextDouble ();
}
sc.close ();
for (i=0; i<marks.length; i++) {