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ZIMSEC A-Level Statistics

6.3.1Probability, events and conditional probability

Probability, events and conditional probability in ZIMSEC A-Level Statistics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic46 practice questions2 lessons
Practise this topicAll Statistics topics

Overview

Form 5.

Learning objectives

What the syllabus expects you to be able to do.

  1. 6.3.1.1Form 5: define probability key terms and calculate probabilities of independent, mutually exclusive, exhaustive and combined events.
  2. 6.3.1.2Form 5: solve problems involving conditional probability.
  3. 6.3.1.3Form 5: use tree diagrams, Venn diagrams and outcome tables to solve problems.

Lessons

  • Conditional probability, independence and tree diagrams

    50 min

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  • Probability: sample spaces, events and the addition rule

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Probability, events and conditional probability: sample question

1 mark

For events AA and BB, P(B)=0.45\mathrm{P}(B) = 0.45 and P(A∩B)=0.18\mathrm{P}(A \cap B) = 0.18. Find P(A∣B)\mathrm{P}(A \mid B).

Only if the answer has a unit, e.g. cm or km/h.

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