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In X∼N(μ,σ2)X\sim N(\mu,\sigma^2)X∼N(μ,σ2), what does the second parameter represent?
A
An interval probability can be calculated using P(a<X<b)=P(X<b)−P(X<a)\boxed{P(a<X<b)=P(X<b)-P(X<a)}P(a<X<b)=P(X<b)−P(X<a).
B
The variance, σ2\sigma^2σ2.
C
Because P(X=20)=0P(X=20)=0P(X=20)=0 for a continuous variable.
D
z=68−605=1.6z=\frac{68-60}{5}=\boldsymbol{1.6}z=568−60=1.6.
Card 1 of 20
2.4.6 Probabilities using the normal distribution (A-level only) Flashcards
20 flashcards on OCR A Level Maths 2.4.6 Probabilities using the normal distribution (A-level only): the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.