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Grade 9 · Data Handling
Collect, Organise & Summarise Data (Grade 9)
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  / 18

Answer all questions. Show all your working — marks are awarded for method as well as the final answer.

  1. 1
    What is the difference between a population and a sample?
    (2)
  2. 2
    Why is surveying only your friends about school food biased?
    (2)
  3. 3
    What is wrong with the intervals 0–10, 10–20, 20–30?
    (2)
  4. 4
    How do a histogram and a bar graph differ?
    (2)
    histogrambars touchbar graphbars have gaps
  5. 5
    In the histogram above, which is the modal class?
    (2)
    12345678930–9710–19920–29530–39240–49
  6. 6
    In the histogram above, how many values are there in total?
    (2)
    12345678930–9710–19920–29530–39240–49
  7. 7
    Find the mean of R8 000, R9 000, R9 500, R10 000 and R80 000.
    (2)
  8. 8
    Find the median of that same salary data.
    (2)
  9. 9
    Which average is fairer for that salary data, and why?
    (2)
TOTAL: 18 marks
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