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Find Harmonic mean {12,17,20} [ Calculator, Method and examples ]

Solution:
Your problem `->` Harmonic mean {12,17,20}


Harmonic mean :
`x``1/x`
120.0833
170.0588
200.05
------
`sum 1/x=0.1922`


HM of X `= n/(sum (f/x))`

`=(3)/(0.1922)`

`=15.6122`








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