TrimmedMean
TrimmedMean[list,f] gives the mean of the elements in list after dropping a fraction f of the smallest and largest elements.
TrimmedMean[list,{f1,f2}] gives the mean when a fraction f1 of the smallest elements and a fraction f2 of the largest elements are removed.
TrimmedMean[list] gives the 5% trimmed mean TrimmedMean[list,0.05].
TrimmedMean[dist,…] gives the trimmed mean of a univariate distribution dist.
Please visit the official Wolfram Language Reference for more details and examples on core symbols.