What this quiz covers

Grade 12 Statistics Quiz 2 draws its questions at random from 36 questions across these topics:

• Central tendency
• Dispersion
• Box & whisker
• Graphs
• Normal & skewness
• Regression
• Misleading statistics

Example questions

A sample of the questions you will practise in this quiz. Work them out yourself - the full solution appears after you answer each one.

1. Which measure of central tendency is affected MOST by one extreme value?
2. A data set has 20 values arranged in ascending order. In which position is the median?
3. Thirty test marks are grouped in intervals of 10. The interval 60–69 has the highest frequency (9 learners). What is the MODAL CLASS?
4. For grouped data, which value represents each interval when you calculate the mean?
5. Thirty marks are grouped and Σ(f × midpoint) = 1 845. Calculate the estimated mean.