A 10% trimmed mean will remove 10% of scores from the top and bottom of ordered scores before the mean is calculated. Imagine we had 20 scores representing the annual income of students (in thousands, rounded to the nearest thousand: 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 35. For example, a 20% trimmed mean is a mean calculated after the top and bottom 20% of ordered scores have been removed. It is a mean calculated after a certain percentage of the distribution has been removed at the extremes.
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