Exercise

Dealing with missing values

In the last exercise, many sectors had an NA value for the harmonic mean. It would be useful for your function to be able to remove missing values before calculating.

Rather than writing your own code for this, you can outsource this functionality to mean().

The dplyr package is loaded.

Instructions 1/2

undefined XP

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Modify the signature and body of calc_harmonic_mean() so it has an na.rm argument, defaulting to false, that gets passed to mean().