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Does the author specify which definition of skewness is being used? There are several and normally do not rely on looking at histograms.

I am guessing that the author is proposing a ([vague](https://stats.stackexchange.com/questions/142259/how-to-determine-skewness-from-histogram-with-outliers)) definition of skewness that you could apply to discrete **quantitative** variables. You could plot an histogram for this and proceed as if you were dealing with a continuous variable.