FIVE NUMBERS ARE WRIITEN IN DESCENDING ORDER IN A ROW. THE AVERAGE OF ALL POSSIBLE QUADRUPLETS OF THESE NUMBERS ARE WRIITEN, IN DESCENDING ORDER IN SECOND ROW. THIS ORDER IS THEN REPEATED FOR SECOND ROW AND SO ON. THE DIFFERENCE OF FIRST AND LAST NUMBERS IN FIRST ROW IS 41 AND DIFFERENCE OF SECOND AND FOYRTH NUMBERS IN SECOND ROW IS 4.1. FIND APPROX DIFF. OF FIRST AND LAST NUMBERS IN SEVENTH ROW

1) 0.01
2) 0.002
3) 0.004
4) 0.001
5) NONE OF THESE