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Deviations are calculated from some value: the mean, the median, the maximum or whatever. You subtract that value from each observed value.
It means that the biggest value (maximum) is 9 more than the smallest value (minimum).
That means it is ten percent of the maximum amount of what you should have in one day of whatever it is.
It can take any value between the maximum and minimum observed values.
The range of a function is the set of values that the function can take. In the context of probability and statistics, it is the difference between the maximum value and the minimum value that a variable can take.