Built-in aggregate functions we provide are listed in Aggregate Functions
article where median and mode functions are not supported out-of-the-box. You can still create a custom aggregate function
and use it inside report expressions. How to implement custom aggregate functions is elaborated in User Aggregate Functions
Note that to use custom functions inside the Standalone Designer
it needs to be extended - check Extending Report Designer
help article for reference.
You can also log a request into our feedback portal
for providing median and mode functions out-of-the-box.
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal
and vote to affect the priority of the items