Averages and Spread (Edexcel GCSE Maths): Flashcards

How data is distributed around the centre

Difference between highest and lowest values

Spread of middle 50% of data

Four equal groups of 25% each

25% of the way through ordered data

50% of the way through ordered data

75% of the way through ordered data

In ascending order

$(n + 1) div 4$

$3(n + 1) div 4$

$Q_3 - Q_1$

Middle 50% of data values

Not affected by extreme values/outliers

Quartiles and other measures easily

$(n + 1) div 2$