What is the Median?
1,2,3 //The median is 2
1,3 //The median is 2 - The average of 1 and 3.
1 //The median is 1
There are lots of other examples. Do they help us remember, understand, design, and communicate clearly? Are they necessary?
Completely Exhaustive Mutually Exclusive (MECE)
Is your understanding and example MECE ? With the above case / concept yes. How do you know? Have someone throw all permutations of finding the median problem at you. Can you solve all of them? If yes your understanding is MECE.