You add all the numbers. Then you divide the numbers by the number that indicates how many numbers you have. For example, the average of 7, 8, and 9 is (7 + 8 + 9) / 3. Here I am dividing by three because there are three numbers.
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The average deviation is always 0.
The average of this data is 16. You find the average by subtracting the smallest number by the largest number.
To find the average of a data set take the sum of the numbers and divide that by the number of data points in the set. In practice, this means doing: (44+28+18)/3=30. 30 is the average.
You cannot. If you have only such summary statistics the detailed information is lost.
you find the mad of the data by