You find the greatest number for the upper extreme and find the lowest number for the lower extreme.
Antipodes are the opposite ends of the Earth, and hence of anything. Antipode and antipodal derive from it.
it is the lower number in a box and whisker plot
An example for an Upper Extreme in math is........Lets say you have 7 numbers,18, 15, 21, 35, 90, 37, 76The Upper Extreme is the HIGHEST number of the bunch...So if you WANT you could put them in...
The lower extreme is the lowest number in a set of data