How to use:
- Enter x values in the text area (comma separated, e.g., 1, 2, 3, 4, 5)
- Click the Calculate button to see the results
- The table will show x, x², x³, x⁴, (x-mean), (x-mean)², (x-mean)³, (x-mean)⁴ values
- The first four moments about zero and about the mean will be calculated
- All calculation steps will be shown for better understanding