AQA A Level Mathematics Statistics 1 questions and answers Graded A complete solution 2024/2025

AQA A Level Mathematics Statistics 1




What are the parameters for a binomial distribution?
X~B(n,p)
(n = number, p = probability)
What are the parameters for a normal distribution?
X~N(µ, σ²)
(µ = population mean, σ² = variance)
What is the binomial equation?




What is the mean of a binomial distribution?
µ = np
What's the variance of a binomial distribution?
σ² = np(1-p)
What values are given in the binomial tables?
P(X < x) - if you want > x then you need to do 1 - P(X < x)
Sigma notation for sample mean?
-x- = ∑x ÷ n
Sigma notation for sample mean of grouped data?
-x- = ∑ƒx ÷ ∑ƒ
Formula for frequency density? (= height on a histrogram)
Class frequency ÷ class width
(More complex) formula for sample standard deviation?




Simpler formula for sample standard deviation?
s = √(1/n-1) (∑x² - (∑x)²/n)
(More complex) formula for population standard deviation?




Simpler formula for population standard deviation?
σ = √(1/n)(∑x² - µ²)