Grouped Frequency Distributions (Leaving Cert Mathematics): Quizzes

To organise data into classes for analysis

When you have more than 20-30 data points

$8$

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

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

Frequency of each class

Mid-interval value

The class with the highest frequency

$(n + 1) ÷ 2$

Cumulative frequency

Classes only, not exact values