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

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

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

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

=(80)/(2.9835)

=26.8137

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