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NBT Quantitative Literacy: Charts, Tables and Graphs Flashcards

7 cards from real NBT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 NBT Quantitative Literacy: Charts, Tables and Graphs flashcards as text

  1. A graph shows daily water consumption in litres per person. The trend line shows a decrease from 250 litres in January to 180 litres in June. What is the approximate monthly decrease?

    Answer: 14 litres

    Total decrease = 70 litres over 5 months (Jan to Jun); average = 70/5 = 14 litres per month.

  2. A table shows a taxi fare structure: R5 boarding fee + R3 per km. What is the fare for a 12 km trip?

    Answer: R41

    Total fare = R5 + (12 × R3) = R5 + R36 = R41.

  3. A bar graph shows that in a survey of 500 people, 200 prefer Brand X and 150 prefer Brand Y. The rest are undecided. How many people are undecided?

    Answer: 150

    Undecided = 500 − 200 − 150 = 150.

  4. A line graph shows rainfall over 4 seasons. The range of the data is 80 mm (minimum 20 mm, maximum 100 mm). If an additional season has rainfall of 110 mm, the new range is:

    Answer: 90 mm

    New range = new maximum − minimum = 110 − 20 = 90 mm.

  5. A compound bar chart shows that in 2022, City A had 60% pass rate and City B had 75% pass rate. In 2023, both cities improved by 5 percentage points each. What is City B's pass rate in 2023?

    Answer: 80%

    City B: 75% + 5% = 80% in 2023.

  6. A scatter graph of height (cm) vs shoe size shows data points clustered around a line going upward from left to right. What type of correlation does this show?

    Answer: Positive correlation

    Points trending upward from left to right indicate that as one variable increases, the other tends to increase — positive correlation.

  7. A table shows prices and quantities. If price increases by 20% and quantity demanded decreases from 500 to 400, by what percentage did quantity decrease?

    Answer: 20%

    Percentage decrease = (100/500) × 100% = 20%.