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Given the choices, I would have to say range. Mode is the number (in this case depth) that shows up most often in a set, and since the greatest depth is only going to theoretically show up once, it certainly wouldn't be the mode. Median is the middle number when all depths measured are put in order from smallest to largest (or vice verse), so the median depth would be significantly shallower than the greatest depth. Mean is another name for average, which again, like the median is going to be somewhere near the middle or half of the maximum depth. The only option left is range. Range is generally the smallest value in a data set subtracted from greatest value possible. So the maximum depth would be the greatest possible value in the range (or the smallest value possible if you use the surface as a reference and everything below it being negative).
A rolling average is a range of the average out of a whole range that fluctuates dependent upon various factors.
the bathyal zone
The mean
The range is 2.5 degrees.