# TRIMMEAN Function

The TRIMMEAN function is one of the statistical functions. It is used to return 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.

The TRIMMEAN function syntax is:

TRIMMEAN(array, percent)

where

array is the range of numeric values to trim and average.

percent is a total percent of data points to exclude from the calculation. A numeric value greater than or equal to 0 but less than 1. The number of excluded data points is rounded down to the nearest multiple of 2. E.g., if array contains 30 values and percent is 0.1, 10 percent of 30 points is 3. This value is rounded down to 2, so 1 point is trimmed from each tail of the data set: 1 from the top and 1 from the bottom of the set.

The values can be entered manually or included into the cell you make reference to.

To apply the TRIMMEAN function,

1. select the cell where you wish to display the result,
2. click the Insert function icon situated at the top toolbar,
   or right-click within a selected cell and select the Insert Function option from the menu,
   or click the icon situated at the formula bar,
3. select the Statistical function group from the list,
4. click the TRIMMEAN function,
5. enter the required arguments separating by commas or select a range of cells with the mouse,
6. press the Enter button.

The result will be displayed in the selected cell.