Question

the harmonic mean of the series 1, 2, 4 is​

Answer 1

Answer:

3/1/1+1/2+1/4

= 3/7/4

=3/0.57

=5.263

Answer 2

Given,

Series = 1, 2, 4

To Find,

Harmonic mean =?

Solution,

The formula for the harmonic mean is =  

Total observations / sum of reciprocal of each observation

Harmonic mean  = $3 / (\frac{1}{1} +\frac{1}{2} +\frac{1}{4} )$

Harmonic mean  = $3 / (\frac{4+ 2+1}{4} )$

Harmonic mean  = $3*4 / 7$

Harmonic mean = $12/7$

Hence, the harmonic mean of the series 1, 2, and 4 is​ 12/7.