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10 cards from this deck
A value indicating position of features in a data set (e.g., mean, median, mode)
Sum of
xˉ=∑xn\bar{x} = \frac{\sum x}{n}xˉ=n∑x
Measures centre; uses all data
n+12\frac{n+1}{2}2n+1
Measures centre; uses only a single data point
When data has no extreme outliers
When data has extreme outliers
Median of the lower list
IQR=UQ−LQ\text{IQR} = UQ - LQIQR=UQ−LQ
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