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 Microsoft Excel > Functions > Statistical > TRIMMEAN
 

TRIMMEAN(array, percent)

 
 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. You can use this function when you wish to exclude outlying data from your analysis.

 arrayThe array or range of values to trim and average.
 percentThe 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, TRIMMEAN excludes a single value from the top and bottom of the data set.
     
  		• 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.

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