A boxplot is a graphical representation of the distribution of a variable. It will contain a box which contains the central 50% of the values.

Within the box, you may see a separation line which indicates the median of the distribution (this line will have an asterisk at each end), and a + symbol indicating the mean.

Extending out from the box will be lines which extend \\three interquartile ranges. Values further than that will be symbolized with zero's (out to four interquartile ranges) or asterisks (beyond).

Asterisks are usually considered potential outliers.