Statistics 5.4.2. Discrete random variables: The binomial and geometric distributions

(9709) CIE A Level Maths 2023 - 2025

1. Revision notes

Key concepts

1. The binomial distribution: In a fixed number of trials, how many successes are there?
2. The geometric distribution: In an infinite number of trials, what is the probability of the first successful trial?
3. Variance Var(X) and expectation/mean E(X)
   

2. Study Powerpoint

*or you can download it here.

* [PDF] Statistics formulae booklet (provided on exam)

3. Exercises (please click)

4. Solutions (please click)