TRIMMEAN

TRIMMEAN(array, percent)

Returns the mean of the interior of a data set.

array	The array or range of values to trim and average.
percent	The fractional number of data points to exclude from the calculation.

REMARKS

* This function rounds the number of excluded data points down to the nearest multiple of 2.
* If percent = 0.1, 10 percent of 30 data points equals 3 points. For symmetry, This function excludes a single value from the top and bottom of the data set.
* This function calculates the mean taken by excluding a percentage of data points from the top and bottom tails of a data set. You can use this function when you wish to exclude outlying data from your analysis.
* If "percent" < 0, then #NUM! is returned.
* If "percent" > 1, then #NUM! is returned.
* For example, if percent = 0.2, 4 points are trimmed from a data set of 20 points (20 x 0.2), 2 from the top and 2 from the bottom of the set.
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

	A
1	=TRIMMEAN({4, 5, 6, 7, 2, 3, 4, 5, 1, 2, 3}, 0.2) = 3.778