In this article, we will learn about how to use the TRIMMEAN function in Excel to calculate the Average or mean for the range of values excluding values by percentage.
|K (in decimal)||percentage||Exclude values from a sorted array|
|0.1||10%||10 percent of 30 values = 3 values|
|0.2||20%||20% percent of 20 values = 4 values|
|0.3||30%||30% percent of 10 values = 3 values|
|0.4||40%||40% percent of 10 values = 4 values|
|0.5||50%||50% percent of 10 values = 5 values|
|0.6||60%||60% percent of 10 values = 6 values|
|0.7||70%||70% percent of 10 values = 7 values|
|0.8||80%||80% percent of 10 values = 8 values|
|0.9||90%||90% percent of 10 values = 9 values|
|1||100%||Returns #NUM! error|
For symmetry, TRIMMEAN excludes a single value from the top and bottom of the sorted data set.
TRIMMEAN function in excel returns a number which is the average or mean of the input numbers and
Syntax of TRIMMEAN function:
value 1 : First value ( necessary )
value 2 : Second value ( optional ). The values can be given using cell reference.
k : percentage in decimal, 0.35 = 35%
All of these might be confusing to understand. So, let's test this formula via running it on the example shown below. Here we have some random data values to test the TRIMMEAN function in Excel.
Here we have a range of values from E2:E20 cell and we need to get the average or mean for the same range using the below formula
Use the formula:
See the formula in the cell. Here array value arguments to the function are given using the cell reference method. Using the above formula in the cell to get the average of values or mean of the values.
The Average or mean for the random data values considering all number values using TRIMMEAN is 102.5789474 and AVERAGE function returns the same result 102.5789474 for the same data set values. But as we change the value of k, the value decreases from the actual value. This difference occurs as the number of values considered decreases in the formula changes.
If the number of values to be extracted is even then the formula deducts two values from the top and two from the bottom in the data sorted. But If the number of values to be extracted is odd. The it extracts two from top and one from bottom
Here are some observational notes shown below.
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