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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 ]

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

Harmonic mean :
 Class Mid value (x)(2) f f/x 10 - 20 15 15 1 20 - 30 25 25 1 30 - 40 35 20 0.5714 40 - 50 45 12 0.2667 50 - 60 55 8 0.1455 --- --- --- --- -- -- n=80 sum (f/x)=2.9835

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

=(80)/(2.9835)

=26.8137

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