Trimmed Mean Calculator
Calculate the trimmed mean (truncated mean) by removing a percentage of extreme values from both ends of the data.
Enter Data
Example Data Sets:
10% Trimmed Mean
32.500000
Regular Mean
35.500000
Median
27.500000
Interquartile Mean
27.500000
Trimmed Std Dev
23.452079
Trimming Details:
Original Count:
10
Trimmed Count:
8
Removed Each End:
1
Removed Values:
Lower: [5]
Upper: [90]
What is Trimmed Mean?
The trimmed mean (or truncated mean) is a measure of central tendency that is more robust to outliers than the arithmetic mean. It is calculated by discarding a certain percentage of the lowest and highest values and then computing the mean of the remaining values. The interquartile mean (IQM) is a special case where 25% is trimmed from each end.
Formula
Trimmed Mean = Sum(x[k+1] to x[n-k]) / (n - 2k)
Where k = floor(trim% * n) values are removed from each end.
Help us improve!
How would you rate the Trimmed Mean Calculator?
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
Formula Source: Standard Mathematical References
by Various