
What is your feature/integration request?
A trimmean function takes a list of numbers and removes a portion of that list before calculating a mean for the new list. It takes two arguments 1. An array 2. a rational number between 0 and 1. It outputs a real number. 
What problem would this feature/integration solve?
It would help me with some statistical modeling and to remove numbers that fall in the 3rd and 4th standard deviations. 
How do you solve/workaround this problem today?
Google sheets.