We put the numbers in order: 3, 4, 4, 4, 7, 8, 9. after crossing out 3 and 9, 4 and 8, and 4 and 7, we see that the median is 4. If we had incorrectly kept only one copy of the 4, then we would have found the median of the list 3, 4, 7, 8, 9 to be 7. We know 4 never would have forgiven us. That is one number that knows how to hold a grudge. | |