Example1. Find value of `X` where Harmonic mean`=24` for data `x,30`
Solution:
HM `=2/(1/x+1/30)`
`24=2/(1/x+1/30)`
`1/x+1/30=2/24`
After solving, we get
`x=20`
2. Find value of `X` where Harmonic mean`=48` for data `40,x`
Solution:
HM `=2/(1/40+1/x)`
`48=2/(1/40+1/x)`
`1/40+1/x=2/48`
After solving, we get
`x=60`
3. Find value of `X` where Harmonic mean`=3.4286` for data `2,x,8`
Solution:
HM `=3/(1/2+1/x+1/8)`
`3.4286=3/(1/2+1/x+1/8)`
`1/2+1/x+1/8=3/3.4286`
After solving, we get
`x=4.0001`
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