Manipulating extracted data from a csv file help!!!

I am trying to extract certain numerical data from a csv file and then manipulate that data, so far I have managed to code the program so I can dispay all the data from the file once the program runs, but i only need a specific piece of that data and I can't get it to work!

I'm sure I need to use sub string and parse int but as i'm very new to java i'm completely lost, I also need to arrange the number data into set ranges i.e. 0-9, 10-19, ...., up to 90-99 and find the average number and display it all to screen please can someone help me!?

here is my code so far:-

import java.io.*;
public class Results
{
public static void main(String[]args)
{
 String line;      //used to read in a line at a time
      
 try
 {
      

File inFile = new File("results.csv");  //create a file object linked to the actual file
             
FileReader reader = new FileReader(inFile); //creates input stream
            
            
BufferedReader buff = new BufferedReader (reader);

line = buff.readLine();      //read first line
while (line != null)            //null value returned when no more to be read
{
 System.out.println(line);      //display int value
 line = buff.readLine(50,52);            //get next value
}
}
catch (IOException e)
{
System.out.println("Error has occurred: " +e);
}
}
}  


 Spodge pls reply asap anybody!