已知某学生三科考试成绩，试求此学生考试成绩总和及平均分，要求平均分保留2位小数。

import java.util.Scanner;
public class average
{
 public static void main(String[] args)
 {
  Scanner ina =new Scanner(System.in);
  int a = ina.nextInt();
  Scanner inb =new Scanner(System.in);
  int b = inb.nextInt();
  Scanner inc =new Scanner(System.in);
  int c = inc.nextInt();
  int sum = 0;
  sum = a+b+c;
  double average = 0;
  average = sum/3;
  System.out.println(String.format("%.2f", average));
 }
}