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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.

 

Download pdf file of Harmonic mean

 

 

 

 

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