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What is Harmonic Mean? In which circumstances Harmonic Mean is used.

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Harmonic mean of a series is the reciprocal of the arithmetic mean of the reciprocal of the values of its items. 

Calculation of Harmonic Mean (H.M.) :

Harmonic Mean is used in the following cases :- 

- For determining average speed or velocity. 

- To find out average price.

- If the item given in the question which is variable is to be kept as constant in the answer, or vice versa, then harmonic mean will be calculated.

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