IAL Statistics 1 Probability exam questions

Exam-style probability questions for Edexcel IAL Statistics 1 (WST01): Venn diagrams, mutually exclusive and independent events, conditional probability.

This resource covers the whole of Chapter 4 (Probability) of the Pearson Edexcel International A Level Statistics 1 course. All questions are original and written in the style of the WST01 paper — these are not reproduced past paper questions.

What’s covered

Calculating probabilities from sample spaces and two-way tables
Venn diagrams and set notation, including complements and intersections
Mutually exclusive and independent events, and testing for independence
The addition and multiplication formulae
Conditional probability and the formula for P(A|B)
Tree diagrams, with and without replacement

How to use it

Works as homework, as consolidation across a sequence of lessons, or as revision before the WST01 paper. Testing whether two events are independent is treated as its own skill, since students often quote the condition without being able to apply it.

What’s included

Question paper (PDF, printable)
Full worked solutions (PDF) — complete method, not just final answers
Questions arranged in increasing difficulty

Specification

Written for Edexcel International A Level Mathematics, Statistics 1 (WST01), Chapter 4. Also suitable for Edexcel A Level Mathematics 9MA0 statistics content and for legacy S1 courses.