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Problem: Harmonic mean {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}} [ Calculator, Method and examples ]

Solution:
Your problem `->` Harmonic mean {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}}


Harmonic mean :
ClassMid value (`x`)
`(2)`
`f``f/x`
10 - 2015151
20 - 3025251
30 - 4035200.5714
40 - 5045120.2667
50 - 605580.1455
------------
----`n=80``sum (f/x)=2.9835`


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

`=(80)/(2.9835)`

`=26.8137`








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