What happens to the mean when an unusually large outlier is added?
For symmetrical data without significant outliers, use the mean and standard deviation.
The mean is pulled upwards.
The range is maximum−minimum\boxed{\text{maximum}-\text{minimum}}maximum−minimum.
It depends on positions, not the sizes of extreme values.
Flashcards for WJEC A Level Maths 2.2.5 Data presentation and interpretation, covering the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4. 22 cards, matched to the WJEC A Level Maths (1300QS) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.
