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Data & Analytics · Foundational

Median

The middle value of ordered data, or the average of the two middle values when the count is even.

Definition

The median is the 50th percentile and is robust to outliers. In right-skewed data the mean exceeds the median, and in left-skewed data the mean is below it.

Example

Median of 3, 5, 9, 20 = (5 + 9) / 2 = 7

Exam tip

Right skew: mean > median; left skew: mean < median.

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