Grouped Frequency Distributions (Leaving Cert Mathematics): Flashcards

Data organised into classes/groups for easier analysis

20-30 data pts, wide range, continuous data, general patterns

Value representing each class; avg of lower & upper boundary

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

$\frac{\sum fx}{\sum f}$

Frequency of each class

Mid-interval value of each class

Sum of (frequency × mid-interval value) for all classes

Total frequency

Class interval with highest frequency

Class interval containing median position

$\frac{n+1}{2}$ where $n$ is total frequency

Don't know exact values within each class, only modal class

Class midpoint