Grouped Frequency Tables (Edexcel GCSE Maths): Flashcards

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

$\frac{\text{Lower endpoint} + \text{Upper endpoint}}{2}$

Class interval with highest frequency

Find the class with the highest frequency

Cannot determine exact modal value

Class interval containing the middle value(s)

$\frac{n+1}{2}$

Count through frequencies to find class with median position

$\frac{\sum(f \times \text{mid-interval value})}{\sum f}$

Using mid-interval values to represent all points in class