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For nnn observations, the mean is [...]\text{[...]}[...].
A
They tend to be widely dispersed around the mean.
B
For nnn observations, the mean is xˉ=∑xn\boxed{\bar{x}=\frac{\sum x}{n}}xˉ=n∑x.
C
The middle 50% span an interval of width 13.
D
Standard deviation is calculated using σ=Var(X)\boxed{\sigma=\sqrt{\operatorname{Var}(X)}}σ=Var(X).
Card 1 of 20
2.5.2 Data presentation and interpretation Flashcards
20 flashcards on CCEA A Level Maths 2.5.2 Data presentation and interpretation: the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.