**Rational**

Find the values after excluding outliers

**Description**

The Excel TRIMMEAN function returns an average (arithmetic mean) after excluding a given percentage i.e. remove from the high and low numbers in a given data set.

**Syntax**

= TRIMMEAN(array, percent)

**Parameters**

**Array **– the range of cells to average **Percentage **– the percentage of values to exclude from the given data array. The percentage can be given either in decimal format or percentage format.

**Return Value**

Average of numbers after excluding percentage from the given array.

**Key Notes**

- The TRIMMEAN function calculates the average (arithmetic mean) of numbers in the range after excluding certain numbers.
- To make the function effective minimum of 10 and 20 data points is required to calculate 20% and 40%, respectively.
- Use AVERAGEIF and AVERAGEIFS to calculate the average for the cells specified by one or multiple conditions.
- To know how many numbers from the top and bottom will be removed in an array is always divided by 2.
- Function ignore the highest and lowest number in the data set be default.

**Example (Image Above)**

Suppose that a list of digits is in a column and user want to find the average of numerical values after excluding certain numbers, the formula can be **=TRIMMEAN(B5:B15,20%).**

It first counts array (B5 to B15) i.e. 11 then it excluded 20% of array(11) i.e. 2.2 then it divides with 2 gives 1.1 so largest (15) and smallest (4) number in the range will not be accounted. Therefore the function returns an average 8.89 after excluding top and bottom numbers.

## Keep Reading Similar Functions:

### AVERAGEIFS

The AVERAGEIFS function returns an average number based on one or multiple given criteria, sum adjacent cells that meet given conditions.

### AVERAGE

The AVERAGE function returns an average of numbers positioned in one or multiple ranges, =AVERAGE(5,15,30) add numbers and divide by 3, and returns 16.67.

### AVERAGEIF

The AVERAGEIF function returns an average figure based on given criteria like =AVERAGEIF({6;8;10;3;5},”>5″) average numbers that are more than 5 and return 8.

### COUNTIF

The COUNTIF function returns a count of number based on given criteria like =COUNTIF(A1:A5,”>5″) that count numbers in the list >5 and returns 3.