Clarify question, closes #993

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Mine Çetinkaya-Rundel 2022-05-09 13:38:57 -04:00
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@ -423,7 +423,7 @@ In the next section we'll explore some techniques for improving this comparison.
1. What happens to missing values in a histogram?
What happens to missing values in a bar chart?
Why is there a difference?
Why is there a difference in how missing values are handled in histograms and bar charts?
2. What does `na.rm = TRUE` do in `mean()` and `sum()`?