Looking at the demos for the Boxplot chart, some of the outliers are marked by a circle, others are marked by a cross. I can't figure out any logic as to why this occurs, see the following jsbin for an example: http://jsbin.com/jayewusowo/1/edit?html,output

Additionally, is it possible to define the marker type for the outliers and the line type for the median and average lines?

Hi Andrew,

In the provided example circles are actually series.extremes while the crosses are series.outliers. Hence their type can be configured via the configuration options: 
- series.outliers.type
- series.extremes.type

Regards,
Iliana Nikolova
Telerik