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ZIMSEC O-Level Additional Mathematics

6.2.5.2Finding the mean and variance

Finding the mean and variance in ZIMSEC O-Level Additional Mathematics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic18 practice questions1 lesson
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Learning objectives

What the syllabus expects you to be able to do.

  1. 6.2.5.2.1Form 4: find the mean, the variance or both of a normal distribution from given probabilities.

Lessons

  • Finding the mean or standard deviation of a normal distribution

    40 min

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Sample question

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

Finding the mean and variance: sample question

1 mark

X∼N(μ,16)X \sim N(\mu, 16) and P(X<30)=0.9332P(X < 30) = 0.9332. Find μ\mu.

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

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