IB Math AI HL · 2021 to 2025
Unit 4: Statistics & Probability
759 past paper questions from 62 papers across 12 exam sessions. See what repeats, then practise the same skills with AI marking.
Starter set across the most-tested skills, with AI marking and model answers.
HL archive · 2021 to 2026
Unit 4: Statistics & Probability
Latest exam session: May 2026
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Topics in Unit 4: Statistics & Probability
In syllabus order. The ring is the share of the marks each one carries.
4.1
Introduction to statistics
2% of marks · 14 questions
4.2
Presentation of data
1% of marks · 16 questions
4.3
Mean, median, and mode
3% of marks · 27 questions
4.4
Correlation of data
4% of marks · 39 questions
4.5
Trial and outcome
1% of marks · 14 questions
4.6
Venn diagrams, trees and combined events
7% of marks · 53 questions
4.7
Discrete random variables
3% of marks · 24 questions
- RisingDiscrete Random Variables
4.8
Binomial distribution
8% of marks · 56 questions
4.9
Normal distribution
6% of marks · 45 questions
4.10
Spearman rank correlation coefficient
4% of marks · 38 questions
- DueSpearman Rank Correlation
4.11
Expected, observed, hypotheses, chi-squared, goodness of fit, and t-test
15% of marks · 110 questions
- RisingContingency Tables and Chi-Squared
4.12
Data collection & validity (HL only)
1% of marks · 14 questions
4.13
Non-linear regression (HL only)
4% of marks · 34 questions
4.14
E(X), Var(X) & estimators (HL only)
6% of marks · 38 questions
4.15
Central limit theorem (HL only)
1% of marks · 4 questions
4.16
Confidence intervals (HL only)
1% of marks · 13 questions
4.17
Poisson distribution (HL only)
6% of marks · 42 questions
4.18
t & z tests, errors (HL only)
15% of marks · 104 questions
4.19
Markov chains (HL only)
10% of marks · 74 questions
Exam pattern
How often each micro-topic has been examined, year by year. Each label is explained under the grid.
Does it repeat?
Top 4 of 38 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|
4.18.1t-tests and z-tests | 19t-tests and z-tests, 2021: 19 questions | 6t-tests and z-tests, 2022: 6 questions | 26t-tests and z-tests, 2023: 26 questions | 13t-tests and z-tests, 2024: 13 questions | 11t-tests and z-tests, 2025: 11 questions | 5t-tests and z-tests, 2026: 5 questions |
| 8Binomial Calculations, 2021: 8 questions | 9Binomial Calculations, 2022: 9 questions | 7Binomial Calculations, 2023: 7 questions | 3Binomial Calculations, 2024: 3 questions | 6Binomial Calculations, 2025: 6 questions | 7Binomial Calculations, 2026: 7 questions | |
| 7Combining variables & estimators, 2021: 7 questions | 5Combining variables & estimators, 2022: 5 questions | 5Combining variables & estimators, 2023: 5 questions | 6Combining variables & estimators, 2024: 6 questions | 6Combining variables & estimators, 2025: 6 questions | 6Combining variables & estimators, 2026: 6 questions | |
4.9.2Normal Probabilities | 12Normal Probabilities, 2021: 12 questions | 1Normal Probabilities, 2022: 1 question | 9Normal Probabilities, 2023: 9 questions | 10Normal Probabilities, 2024: 10 questions | 5Normal Probabilities, 2025: 5 questions | 3Normal Probabilities, 2026: 3 questions |
4 more micro-topics with a free account
- DueSpearman Rank Correlation· last May 25 P3 TZ2
- Dueusually examined, but missing from the last two exam sessions
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Questions on Unit 4: Statistics & Probability, by exam session
Which papers asked about Unit 4: Statistics & Probability, and which question numbers. Open a paper to see them highlighted.
May 2026
20 questions across 9 papers
November 2025
8 questions across 3 papers
May 2025
20 questions across 9 papers
November 2024
6 questions across 3 papers
May 2024
16 questions across 6 papers
November 2023
7 questions across 3 papers
May 2023
28 questions across 8 papers
November 2022
7 questions across 3 papers
May 2022
17 questions across 6 papers
November 2021
6 questions across 3 papers
May 2021
17 questions across 6 papers
Specimen 2021
10 questions across 3 papers
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Frequently asked questions
Short answers about this page.
Which Math AI HL exam sessions are covered for Unit 4: Statistics & Probability?
12 exam sessions from 2021 to 2026, the latest May 2026. Every Paper 1, 2 and 3 in every timezone is read and classified in full, which gives 62 papers in this archive.
Which Unit 4: Statistics & Probability topic comes up most?
t-tests and z-tests (4.18.1): in 48% of papers, last seen May 26 P3 TZ3. Usually "State", worth about 6.7 marks in a paper that includes it.
Can I see the original question and mark scheme?
No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.
What do "banker", "due" and "rising" mean?
Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.
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