Example1. Find Harmonic mean for data `20,30`
Solution:
HM `=N/(1/x_1+1/x_2)`
`=2/(1/20+1/30)`
After solving, we get
HM `=24`
2. Find Harmonic mean for data `60,40`
Solution:
HM `=N/(1/x_1+1/x_2)`
`=2/(1/60+1/40)`
After solving, we get
HM `=48`
3. Find Harmonic mean for data `2,4,8`
Solution:
HM `=N/(1/x_1+1/x_2+1/x_3)`
`=3/(1/2+1/4+1/8)`
After solving, we get
HM `=3.4286`
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