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Measure of dispersion:                                                                        
Harmonic mean                                                                             Bookmark and Share

The reciprocal of arithmetic mean of reciprocal of items in the data is called Harmonic mean.

Individual series:


Where N is the total number of items.

x1, x2, x3………….xn are items in the data.


Discrete series:


Where fi is the frequency of ith item.


Continuous series:


where xi = mid point of class intervals.


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