IB Maths AA 4.6 Definitions

This page contains our IB Maths AA definitions for 4.6. By learning each one of these definitions, you will fully cover the content for IB Maths AA 'Probability distributions'.

All Topic 4 Sub-topics 4.1: Fundamentals Of Statistics 4.2: Visualising Statistics 4.3: Distribution Properties 4.4: Linear Statistics 4.5: Probability 4.6: Probability Distributions (HL)4.7: Bayes theorem (HL)4.8: Advanced distribution properties

discrete

Taking separate, countable values, usually whole numbers.

mean

The expected value of a random variable; if $X \sim \mathrm{Poisson}(\lambda)$ , then $E(X) = \lambda$

probability

Measures how likely an event is to happen, taking a value between $0$ and $1$ , where $0$ means impossible and $1$ means certain.

random

Describing an outcome that cannot be predicted with certainty in advance, even though long-run patterns may be modelled using probabilities.

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