you find the mad of the data by
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The mean of a set of data is the sum of that data divided by the number of items of data.
One reason I can think of why you might not be able to find the mean of numerical data would be if there were missing data points.
Subtract the largest data with lowest data
You subtract the smallest data point from the largest data point in the set. The result is the range.
when there are extreme values in the data