Question

Find the all formula of harmonic mean with example

Answer 1

The harmonic mean is a very specific type of average. It’s generally used when dealing with averages of units, like speed or other rates and ratios.

The formula is:
harmonic mean formula
If the formula above looks daunting, all you need to do to solve it is:

Add the reciprocals of the numbers in the set.
Divide the number of items in the set by your answer to Step 1.
Not that great with calculating reciprocals? Try this online calculator.

Example
What is the harmonic mean of 1,5,8,10?

Add the reciprocals of the numbers in the set: 1/1 + 1/5 + 1/8 + 1/10 = 1.425
Divide the number of items in the set by your answer to Step 1. There are 4 items in the set, so:
4 / 1.425 = 2.80702
hope helping......