Question

i’m trying to display the average mark of students, but it’s display the wrong number, this is what i’ve tried. Any help would be greatly appreciated.

import java.util.ArrayList;

class Course
{

  private ArrayList<Student> people = new ArrayList<Student>();  

// return the average mark in the course

  public double average()
  {
        double average = 0.0;
        int i = 0;

        for (i = 1; i < people.size(); i++)
        {
            int tmark = people.get(i).getMark() ; 
            {
                average = tmark / i;
            }       
        }
        return average;
  }

} 

Answer 1

sure, you are not calculating average.. you have to divide by the size after summing all the values:

public double average()
{
     double average = 0.0;
     for (int i = 0; i < people.size(); i++)  {
         average += people.get(i).getMark() ; 
     }
     return average/people.size();
 }