TRIMMEAN
Category: Statistical Function.
Description: Returns the mean of the interior of a data set. TRIMMEAN calculates the mean taken by excluding a percentage of data points from the top and bottom tails of a data set.
Syntax: TRIMMEAN(array, percent)
The TRIMMEAN function syntax has the following arguments:
Array: array or range of values to trim and average.
Percent: fractional number of data points to exclude from the calculation.