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ZIMSEC O-Level Additional Mathematics

6.2.4.1Discrete random variables and the binomial distribution

Discrete random variables and the binomial distribution in ZIMSEC O-Level Additional Mathematics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic40 practice questions2 lessons

Learning objectives

What the syllabus expects you to be able to do.

  1. 6.2.4.1.1Form 4: define a discrete random variable and use its probability distribution table to find E(X), Var(X) and unknown values.
  2. 6.2.4.1.2Form 4: state the characteristics of a binomial model, use it to calculate probabilities and calculate its mean and variance.

Lessons

  • Discrete random variables: distributions, expectation and variance

    45 min

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  • The binomial distribution

    50 min

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Sample question

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

Discrete random variables and the binomial distribution: sample question

1 mark

X∼B(6,0.4)X \sim B(6, 0.4). Find P(X=2)P(X = 2), correct to 3 significant figures.

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

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