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12 cards from this deck
Data organised into intervals or ranges
Simplifies large data sets
Makes patterns and trends easier to spot
Middle point of an interval
Add lowest and highest values, divide by 222
10+202=15\frac{10 + 20}{2} = 15210+20=15
Represents entire interval for calculations
Multiply each mid-interval by its frequency
Divide sum by total frequency
Frequencies added progressively down the table
Mid-interval of interval containing middle value
Interval with highest frequency
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