Averages (OCR GCSE Maths): Flashcards

Add all values, divide by number of values

$\frac{\text{Sum of all values}}{\text{Number of values}}$

Middle value when data arranged in ascending order

Average of the two middle numbers

Value that appears most frequently in data set

Largest value minus smallest value

Data varies greatly

Data is more consistent

Arrange data values in ascending order

There is no mode

Not affected by outliers

Heavily affected by outliers

Use mid-points of each group

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

$\frac{\sum(\text{Midpt} \times \text{Freq})}{\text{Total freq}}$