You take the smallest number in of data and subtract it from the biggest number.
For example in 34, 41, 37, 29, and 34 the biggest number is 41 and the smallest number is 29, so you do 41-29 which is 12.
Your range is 12.
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You treat each observation in a particular range as if it were the middle value of that range.
If you are trying to find the median, it's the average of the two.
A rolling average is a range of the average out of a whole range that fluctuates dependent upon various factors.
A single number does not have a range so you cannot find it.
The mean