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10 cards from this deck
A systematic way to organise data showing scores and their counts
Score, Tally, Frequency
Ascending order (smallest to largest)
Sum of frequencies = total number of data points
The arithmetic average of a dataset
xˉ=∑xn\bar{x} = \frac{\sum x}{n}xˉ=n∑x
The middle value when scores are arranged in order
Average of the two middle values
The score that appears most frequently
Mean is sensitive to extreme values/outliers
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