H2 Maths Notes (JC 1-2): 6.2) Discrete Random Variables

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07 Oct 2025, 00:00 Z

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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 2025-11-29 (PDF last modified 2024-10-16). Topic 6.2 scope unchanged; Section B still contributes 30 marks per paper (Probability & Statistics).

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 Notes (JC 1-2): 6.2) Discrete Random Variables

Core Concepts

Binomial Model

Custom PMFs

Transformations

Calculator Workflows

Exam Watch Points

Practice Quiz

Quick Revision Checklist

Sources

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