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Find Harmonic mean {12,17,20}

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

 x 1/x 12 0.0833 17 0.0588 20 0.05 --- --- sum 1/x=0.1922

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

=(3)/(0.1922)

=15.6122

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