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HomeCIE IGCSE MathematicsProbability: Basic probability and probability scale
CIE · IGCSE · Mathematics

Probability: Basic probability and probability scale
Practice Questions

20 CIE IGCSE Mathematics questions on Probability: Basic probability and probability scale, 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 balls, 3 blue balls and 2 green balls. A ball is taken at random from the bag. What is the probability that the ball is blue?

  1. 0.2
  2. 0.3
  3. 0.5
  4. 0.8
Show answer & explanation
✓ Answer: B0.3
3. Award 1 mark for correctly calculating P(blue) = 3/10 = 0.3. A is incorrect — this is P(green) = 2/10. C is incorrect — this is P(red) = 5/10. D is incorrect — this represents P(not green) = 8/10.
Question 2 · 1 mark · Difficulty 1/3

On a probability scale, an event that is certain to happen is represented by which value?

  1. 0
  2. 0.5
  3. 1
  4. 100
Show answer & explanation
✓ Answer: C1
Award 1 mark for identifying that certainty is represented by 1 on the probability scale. A is incorrect — 0 represents impossibility. B is incorrect — 0.5 represents an equally likely event. D is incorrect — probabilities are expressed as values between 0 and 1, not as percentages on the scale.
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CIE IGCSE Mathematics: Probability: Basic probability and probability scale FAQ

How many CIE IGCSE Mathematics questions on Probability: Basic probability and probability scale are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Probability: Basic probability and probability scale for CIE IGCSE 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 CIE 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 CIE IGCSE 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: Basic probability and probability scale practice with other Mathematics topics or even switch to a totally different CIE 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: Basic probability and probability scale questions aligned to the official CIE IGCSE Mathematics syllabus?
Every question is written against the published CIE IGCSE Mathematics specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE 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 CIE.
How is Probability: Basic probability and probability scale typically tested on CIE IGCSE Mathematics papers?
Probability: Basic probability and probability scale appears across multiple question types on real CIE IGCSE 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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