If a whisker is more than 1.5 times as long as the box, then the whisker contains one or more possible outliers. It can tell you about your outliers and what their values are.Ĭan there be more than one outlier in boxplot? What are the characteristics of a box plot? A boxplot is a standardized way of displaying the distribution of data based on a five number summary (“minimum”, first quartile (Q1), median, third quartile (Q3), and “maximum”). Q1 is the median (the middle) of the lower half of the data, and Q3 is the median (the middle) of the upper half of the data.