Is Topic 6.2 in Paper 1 or Paper 2?

Topic 6.2 is part of Probability & Statistics and is assessed in Paper 2 Section B (60 marks). Paper 1 covers Pure Mathematics only.

Can I use the GC for binomial probability calculations?

Yes. binompdf and binomcdf (TI) or BPD and BCD (Casio) are expected tools. You must still write down the model \$X \sim \operatorname\{Bin\}(n, p)\$, state the probability expression (e.g. \$P(X \geq 3)\$), and show that you are using the complement or cumulative form correctly.

What is the difference between a discrete random variable question and a binomial question?

A general discrete random variable question gives you a custom PMF table, while a binomial question describes a scenario with \$n\$ independent trials. The binomial is a special case of a discrete random variable. For a custom PMF, you work directly from the table; for binomial, you use the formula \$\binom\{n\}\{r\}p^r(1-p)^\{n-r\}\$ or the GC. ---

H2 Maths Discrete Random Variables | Free Notes

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07 Oct 2025, 00:00 Z· Last updated 13 Jan 2026

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Q: What does H2 Maths Notes (JC 1-2): 6.2) Discrete Random Variables cover?
A: Expectation, variance, binomial modelling, and calculator workflows for H2 discrete distributions.

Study cadence
Re-derive the expectation and variance formulas from first principles once per week so you remember why each term appears. Keep a small table template in your notes for probability mass functions (PMFs) so you can slot in values quickly during exams.

Status: SEAB H2 Mathematics (9758, first exam 2026) syllabus last checked 2026-01-13 (PDF last modified 2024-10-16). Topic 6.2 is assessed in Paper 2 Section B (Probability & Statistics, 60 marks) and focuses on discrete distributions and the binomial model.

Core Concepts

A discrete random variable $X$ takes countable values $x_1, x_2, \dots$

$x$	$0$	$1$	$2$	$3$
$P\left( X = x \right)$	$0.1$	$0.3$	$0.4$	$k$

H2 Maths Discrete Random Variables | Free Notes

Core Concepts

Binomial Model

Custom PMFs

Transformations

Calculator Workflows

Exam Watch Points

Practice Quiz

Quick Revision Checklist

Common exam mistakes

Frequently asked questions

Sources

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