CAS Exam MAS-I exam at a glance
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CAS Exam MAS-I key facts & eligibility
| Conducting body | Casualty Actuarial Society (CAS) |
|---|---|
| Official website | casact.org ↗ |
| Mode | Modern Actuarial Statistics I (MAS-I) — a computer-based, multiple-choice examination (delivered via Pearson VUE) that is one of the credentialing exams on the path toward the ACAS (Associate of the Casualty Actuarial Society). |
| Frequency | Offered in exam windows during the year, as scheduled by the CAS. |
| Scoring & marking | The exam is organised into two broad areas — Probability Models (including stochastic processes, frequency and severity models, and the Poisson process) and Statistics (estimation, hypothesis testing, and linear/generalized linear models). It is a multiple-choice paper of roughly four hours. |
| Score validity | A pass counts permanently toward your CAS credential requirements. |
| Language | English. |
Who is eligible for CAS Exam MAS-I?
Open to actuarial candidates pursuing CAS credentials; probability and mathematical-statistics background is expected.
Last verified July 2026 against CAS — Exam MAS-I. Always confirm current details on the official website before you register.
CAS Exam MAS-I section breakdown
The CAS Exam MAS-I mock test on Wrexa Edge replicates the real exam's section structure — same names, same question count per section, same time limits. No inter-section breaks — the timer runs continuously.
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CAS Exam MAS-I (50 Q)
Marking scheme
+1 per correct. Try your score.
Strategy: CAS Exam MAS-I has no negative marking. Attempt every question — blank answers cost you potential marks but cannot pull your score down.
Scale: CAS Exam MAS-I (pass 700/1000).
How CAS Exam MAS-I is conducted
- Mode
- Test format
- Backtracking
- Mark for review
CAS Exam MAS-I time strategy
With 50 questions in 240 minutes, you have about 288 seconds per question on average. Successful candidates aim for the following pacing on each section:
- CAS Exam MAS-I (50 Q)
Wrexa Edge's analytics show your actual time-per-question after every mock so you can spot which sections you're losing time on.
CAS Exam MAS-I topics covered
Across the 50 Wrexa Edge variants of CAS Exam MAS-I, the following topics appear most often (sample distribution from one variant):
CAS Exam MAS-I (50 Q)
- CAS MAS-I — Extended linear models · 10
- CAS MAS-I — Poisson processes · 8
- CAS MAS-I — Estimation · 8
- CAS MAS-I — Hypothesis testing · 7
- CAS MAS-I — Life contingencies · 6
- CAS MAS-I — Markov chains · 6
- CAS MAS-I — Exponential & memoryless · 3
- CAS MAS-I — Reliability · 1
CAS Exam MAS-I difficulty calibration
Elite tier. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months.
CAS MAS-I · ~45 Q in 4h. Probability models (stochastic processes, frequency/severity), statistics (estimation, hypothesis testing) & GLMs. · Official language: English.
Verified content — Wrexa Edge's CAS Exam MAS-I bank has been deeply curated with real exam-aligned content (estimated 100% syllabus coverage).
How Wrexa Edge prepares you for CAS Exam MAS-I
- Real test-day interface
- 50 distinct variants
- Detailed analytics
- Spaced repetition (Notebook)
- Optional proctoring
- Free to start
Expert take: what CAS Exam MAS-I really tests
CAS Exam MAS-I (Modern Actuarial Statistics I) is a computer-based, multiple-choice exam of roughly four hours on the path toward the ACAS. It has two broad areas — Probability Models (stochastic processes, frequency/severity, the Poisson process) and Statistics (estimation, hypothesis testing, and linear/generalized linear models).
Preparation tips
- Balance the two sections — Probability Models and Statistics.
- Master generalized linear models, which underpin insurance pricing.
- Drill past CAS exams and study the examiner’s reports.
Common mistakes to avoid
- Focusing on one section and neglecting the other.
- Under-practising GLMs and the stochastic-process material.
CAS Exam MAS-I study plan
A phase-by-phase roadmap from your first concept to test-ready. Stretch or compress each phase to fit the time you have before your attempt.
- Stochastic processes and the Poisson process
- Frequency and severity models
- Topic-wise problem practice
- Estimation and hypothesis testing
- Linear and generalized linear models
- Past-exam problem sets
- Full-length timed practice exams
- Balance both sections
- Review examiner’s reports
Where CAS Exam MAS-I can take you
A strong CAS Exam MAS-I result opens up these careers and higher-study paths:
- Toward ACAS
- P&C actuarial base
- GLM foundations
- Two-section exam
Best books & official prep for CAS Exam MAS-I
- CAS MAS-I syllabus & past exams — CAS
- MAS-I study manuals (ACTEX, ASM, GOAL) — Various
Official practice: Work from the official CAS MAS-I syllabus and past exams; balance the two sections — Probability Models and Statistics (including generalized linear models).
Previous-year papers: The CAS publishes past MAS-I exams and examiner’s reports on its website.
Sample CAS Exam MAS-I practice questions
5 questions taken from the CAS Exam MAS-I mock tests on Wrexa Edge. Try each one, then reveal the answer.
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Q1. With known σ = 10, n = 100, sample mean 52 and H₀: μ = 50, what is the z test statistic?
- 0.2
- 20.0
- 0.02
- 2.0
Show answer
Answer: D — 2.0
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Q2. For a Poisson process, given that exactly n events occurred in (0, t], the unordered arrival times are distributed as:
- Independent uniform random variables on (0, t)
- Independent exponential variables with mean t/n
- Equally spaced points at intervals of t/n
- Independent normal variables centred on t/2
Show answer
Answer: A — Independent uniform random variables on (0, t)
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Q3. Makeham's law of mortality specifies the force of mortality as:
- μ_x = B·c^x
- μ_x = A + B·c^x
- μ_x = 1 / (ω − x)
- μ_x = A·x + B
Show answer
Answer: B — μ_x = A + B·c^x
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Q4. The canonical link function for a binomial (logistic) GLM is the:
- Log link
- Probit link
- Logit link
- Identity link
Show answer
Answer: C — Logit link
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Q5. A system has two independent components in parallel with reliabilities 0.9 and 0.8. What is the system reliability?
- 0.72
- 0.85
- 0.90
- 0.98
Show answer
Answer: D — 0.98
Frequently asked questions
- What is the CAS Exam MAS-I exam pattern?
- Casualty Actuarial Society — Exam MAS-I (Modern Actuarial Statistics I) contains 50 questions across 1 section: CAS Exam MAS-I (50 Q). Total duration is 240 minutes (about 288 seconds per question).
- Does CAS Exam MAS-I have negative marking?
- No — CAS Exam MAS-I has no negative marking. Each correct answer is worth 1 mark, so attempt every question.
- How is CAS Exam MAS-I scored?
- Scaled score range: 100 to 1000. CAS Exam MAS-I (pass 700/1000).
- How can I practise CAS Exam MAS-I online for free?
- Wrexa Edge gives you a free full-length CAS Exam MAS-I mock test — with instant scoring, detailed explanations and analytics — plus 49 more with a one-time $1.99 unlock that never expires. Start practising in under a minute, no card required.
- What is the difficulty level of CAS Exam MAS-I?
- CAS Exam MAS-I is rated Elite difficulty on Wrexa Edge. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months. CAS MAS-I · ~45 Q in 4h. Probability models (stochastic processes, frequency/severity), statistics (estimation, hypothesis testing) & GLMs. · Official language: English.
- How long is the CAS Exam MAS-I exam?
- CAS Exam MAS-I runs for 240 minutes total. On Wrexa Edge the timer is enforced exactly as on the real exam — including no inter-section breaks.
- What topics are covered in CAS Exam MAS-I?
- CAS Exam MAS-I is split into: CAS Exam MAS-I (50 Q). Each section is timed and weighted separately. CAS MAS-I · ~45 Q in 4h. Probability models (stochastic processes, frequency/severity), statistics (estimation, hypothesis testing) & GLMs. · Official language: English.
- What tools or aids are allowed during CAS Exam MAS-I?
- No special tools are required. Note: real exam is proctored — Wrexa Edge mirrors this with a webcam-based proctoring flow you can enable.
- Is the CAS Exam MAS-I test adaptive?
- No — CAS Exam MAS-I is a fixed-form (linear) test. Every candidate sees the same number of questions per section.
- How many CAS Exam MAS-I mock tests does Wrexa Edge offer?
- Wrexa Edge generates 50 distinct CAS Exam MAS-I variants — each with different question content, not just shuffled options — the first one free for everyone and 49 more with a one-time $1.99 unlock. That's 2500 unique practice questions in the real test-day interface.
- Is there a free CAS Exam MAS-I test series 2026?
- Yes. The Wrexa Edge CAS Exam MAS-I test series for 2026 gives you a free full-length mock test (50 in total) plus subject-wise and topic-wise tests — instant scoring and detailed analysis, no card required.
- Are CAS Exam MAS-I previous year question–style papers included?
- Every CAS Exam MAS-I mock is modelled on the official exam pattern and the style of previous years' papers — the same 50-question structure, sections and marking — so your practice mirrors the real paper you'll sit.
- Which is the best free CAS Exam MAS-I mock test online?
- Wrexa Edge's CAS Exam MAS-I mock test replicates the real exam interface, timing and marking scheme, with instant score, section-wise analysis and 50 fresh variants — a strong free choice for 2026 preparation.
- Can I take the CAS Exam MAS-I mock test on mobile?
- Yes. CAS Exam MAS-I mock tests run in any browser on mobile, tablet or desktop — no app or download needed. Start on your phone and your progress and analytics sync when you sign in.
- What is the CAS Exam MAS-I syllabus?
- The CAS Exam MAS-I syllabus maps to its 1 section: CAS Exam MAS-I (50 Q). Wrexa Edge's mock tests cover the complete syllabus topic by topic — see the topics-covered breakdown above — so you practise every area at real exam difficulty.
- What is the eligibility for CAS Exam MAS-I?
- Open to actuarial candidates pursuing CAS credentials; probability and mathematical-statistics background is expected. Wrexa Edge focuses on realistic CAS Exam MAS-I practice: a free full-length mock in the exact exam pattern, ready whenever you are.
- When is the CAS Exam MAS-I exam and how should I prepare?
- Official CAS Exam MAS-I exam dates are announced by the conducting body for each cycle — check the latest notification for the current schedule. To be ready, follow a phased study plan and take full-length timed mocks; Wrexa Edge gives you a free CAS Exam MAS-I mock with instant scoring so you can track your readiness week by week.
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