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HomeCXC CSEC MathematicsProbability – classical probability, experimental probability, sample space, combined events, simple tree diagrams
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Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams
Practice Questions

21 CXC CSEC Mathematics questions on Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. A marble is drawn at random from the bag. What is the probability of drawing a blue marble?

  1. 1/10
  2. 3/10
  3. 1/3
  4. 3/7
Show answer & explanation
✓ Answer: B3/10
Award 1 mark for correctly identifying probability = number of blue marbles / total marbles = 3/10. A is incorrect — this would be probability of 1 marble out of 10. C is incorrect — this confuses the calculation with 3 out of 9. D is incorrect — this incorrectly excludes green marbles from the total.
Question 2 · 1 mark · Difficulty 1/3

During a cricket match in Barbados, the probability that it will rain is 0.3. What is the probability that it will NOT rain during the match?

  1. 0.3
  2. 0.5
  3. 0.7
  4. 1.3
Show answer & explanation
✓ Answer: C0.7
7. Award 1 mark for applying P(not rain) = 1 - P(rain) = 1 - 0.3 = 0.7. A is incorrect — this is the probability of rain, not no rain. B is incorrect — this assumes equal probability. D is incorrect — probability cannot exceed 1.
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CXC CSEC Mathematics: Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams FAQ

How many CXC CSEC Mathematics questions on Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams are there on Kramizo?
Kramizo currently has 21 exam-board-aligned practice questions on Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams for CXC CSEC Mathematics, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Mathematics?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams practice with other Mathematics topics or even switch to a totally different CXC subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams questions aligned to the official CXC CSEC Mathematics syllabus?
Every question is written against the published CXC CSEC Mathematics specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC.
How is Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams typically tested on CXC CSEC Mathematics papers?
Probability – classical probability, experimental probability, sample space, combined events, simple tree diagrams appears across multiple question types on real CXC CSEC Mathematics papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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