Hello! ;)
Firstly, range is the difference between the largest value and the smallest. So largest - smallest = range.
In this case, the largest value is 175 because the dot is highest up.
The smallest value is 25 because it is the lowest dot.
So, 175 (largest) - 25 (smallest) = 150 (range).
Hope I helped and wasn’t too late on answering!
Good luck!
~ Destiny ^_^
