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A boxplot provides a statistical summary of the data, representing the first quartile, the second quartile (or median) and the third quartile. Boxplot boundaries are calculated by subtracting the Inter-Quartile Range (IQR) multiplied by 1.5 from the first quartile, and adding it to the third quartile. Values outside these boundaries may be considered outliers.
Boxplots can be added to a chart through the "distribution plot" option.