What is the harmonic mean?

The harmonic mean has been causing a stir in the r/datascience subreddit recently. In this video I explain what the harmonic mean is and when it is appropriate to use it. I then work through the job interview question from Reddit, solving it first with a numeric approach, then with the harmonic mean.

Question: "You travelled half of the distance with a speed 30km/h, and the other half - 50km/h. What is the average speed?

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