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Why can an outlier make the mean unrepresentative?
A
Arrange the data in ascending order.
B
The group is more consistent, with values less dispersed around the mean.
C
The mean uses every value, so an extreme value can shift it substantially.
D
For nnn observations, the arithmetic mean is xˉ=∑xn\boxed{\bar{x}=\frac{\sum x}{n}}xˉ=n∑x.
Card 1 of 23
2.2.3 Central tendency, variation and standard deviation Flashcards
23 flashcards on AQA A Level Maths 2.2.3 Central tendency, variation and standard deviation: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.