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10 cards from this deck
Any number calculated from data
Statistics showing where the 'middle' or 'typical' value lies
xˉ=Σxn\bar{x} = \frac{\Sigma x}{n}xˉ=nΣx
Sum of
The mean
The middle value when observations are arranged in order
Arrange all observations in ascending order
(n+12)\left(\frac{n+1}{2}\right)(2n+1)th observation
When data is skewed or contains outliers
The mean is pulled towards extreme values
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