/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        int[][] numbers = {{10,11,12,15,18}, {10,11,12,15,21}};
 
        for (int i=0; i<numbers.length; i++) {
            double sum = 0;
            for (int j=0; j<numbers[i].length; j++)
                sum += numbers[i][j];
 
            double avg = sum / numbers[i].length;
            System.out.println("Srednia = " + avg);
        }
	}
}

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