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One weird row is throwing off my average and I can't tell if it's a mistake or a real result.
What you'll have at the end
A short list of flagged rows, each checked and labelled kept, fixed, or removed, before the summary numbers are reported.
You need
A column of numbers already loaded in a spreadsheet or table, plus something outside that column you could check a suspicious value against: a reference document, a source system, or someone who can confirm it.
Not covered
Building a script or pipeline that reruns this check automatically on every future data load.
Pick the average that represents a skewed column
Every flagged row turns out genuine and the column stays lopsided: that recipe picks the average that actually represents it.
Measure a column's skew to know if the average can be trusted
The whole column looks lopsided in general, rather than around one flagged row: that recipe measures the shape instead of chasing a single value.
Checked 26 Aug 2026
Part of the Descriptive Statistics cookbook