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I know the first derivative gives you the critical point which is the harmonic mean but I’m having trouble proving it because my calculus is a little subpar. I also need help proving why there is a minimum at that critical point using the second derivative. Thanks!
are portive at the vale of 邝 the harmonte mean
math   Statistics-And-Probability   
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hivth thet 2h に! 3 h 40 に! aht So, LItk) is mininum for h

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