Cumulative Frequency (Edexcel GCSE Maths): Quizzes

A running total of frequencies

Add current frequency to all above it

Each must be larger than previous one

The upper boundary

With a smooth curve

$\frac{1}{2} \times \text{total frequency}$

$\frac{1}{4} \times \text{total frequency}$

$\frac{3}{4} \times \text{total frequency}$

Upper quartile - Lower quartile

Spread of middle 50% of data

Not affected by outliers

Horizontally to the curve