Discrete Series
Steps to Calculate Mean Deviation
- Determine the specific average from which the mean deviation will be calculated.
- Determine each observation’s absolute (positive) deviation from the specific average, or |D|.
- Multiply the absolute deviations |D| by the respect frequencies (f) to obtain the sum of products to get Σf|D|
- To calculate the mean deviation, divide Σf|D| by the number of items.
Example:
Calculate the mean deviation from mean and median for the following distribution.
Solution:
Mean Deviation from the Mean
Mean = 6.85
Mean Deviation from Mean = 0.82
Mean Deviation from the Median
= Size of 23th item
Median = 7
Mean Deviation from Median = 0.78