How can we check Average value of Numbers in Rules Engine

Hello,

I’ve check documentation for Mediation and found that we can check Mediation number and Average number, but gif pictures and my Rules engine have different tools and I can’t understand why.

Here is the link of Docs: https://support.gainsight.com/Gainsight_NXT/03Rules_Engine/02Admin_Guides/Application_of_Statistical_Functions_in_Rules_Engine

Example: I have variable a=[1,3,2,5,4,1,1,2]

Target: Need extract Average value and populate another object b=Number

It would be perfect if I can extract Mediation and Average values into b and c objects.

Thank you!