Continuous Series
Mean deviation formulas for continuous series are the same as those for discrete series. The mid-points of class intervals must be determined for the given continuous frequency distribution and are taken as ‘m’. A continuous series takes on the shape of a discrete series in this way. All of the discrete series’ steps are then applied after that.
Example:
Calculate the mean deviation from the mean and median for the following data:
Solution:
Mean Deviation from the Mean
Mean = 9.42
Mean Deviation from Mean = 3.59
Mean Deviation from the Median
= Size of 7th item
Therefore, the median lies in the group 8-12
l1 = 8, c.f. = 5, f = 4, i = 4
Median = 10
Mean Deviation from Median = 3.42