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13 cards from this deck
Ranges or categories of values
Makes large datasets easier to handle and interpret
No overlap, no gaps, all values covered
Middle point of each class interval
Lower endpoint+Upper endpoint2\frac{\text{Lower endpoint} + \text{Upper endpoint}}{2}2Lower endpoint+Upper endpoint
Class interval with highest frequency
Find the class with the highest frequency
Cannot determine exact modal value
Class interval containing the middle value(s)
n+12\frac{n+1}{2}2n+1
Count through frequencies to find class with median position
∑(f×mid-interval value)∑f\frac{\sum(f \times \text{mid-interval value})}{\sum f}∑f∑(f×mid-interval value)
Using mid-interval values to represent all points in class
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