How to use the trimmed mean calculator
Find the average after removing the lowest and highest 10 percent of values. Enter data values in the field above; the trimmed mean (10% each end), untrimmed mean are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “trimmed mean”, “average without outliers”, “10 percent trimmed average”, “calculate trimmed mean”, “find trimmed mean”.
Formula
Variables
- d — Data values
Worked example
With data values = 3,7,8,5,12,14,21,13,18,40, the calculator gives trimmed mean (10% each end) ≈ 12.25; untrimmed mean ≈ 14.1.
Frequently asked questions
What is the trimmed mean calculator used for?
Find the average after removing the lowest and highest 10 percent of values. It helps with questions such as “trimmed mean”, “average without outliers”, “10 percent trimmed average”.
What is the formula for the trimmed mean calculation?
Trimmed mean (10% each end) = mean(sorted(d).slice(floor(len(d) × 0.1),len(d)-floor(len(d) × 0.1))). Untrimmed mean = mean(d). Here d is data values.
What inputs do I need for the trimmed mean calculator?
You need data values. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the trimmed mean calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the trimmed mean result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.