NBT Quantitative Literacy: Charts, Tables and Graphs Flashcards

A bar chart shows sports participation: soccer 180, rugby 120, netball 60, cricket 40. What percentage of participants play soccer?

Answer: 45%

Total = 400; soccer % = 180/400 × 100% = 45%.

A line graph of a school's enrolment shows consistent growth. In 2018, enrolment was 800; in 2022 it was 1 000. Extrapolating, what would be expected in 2024?

Answer: 1 100

Annual increase = 200/4 = 50 per year; 2024 projection = 1 000 + 2 × 50 = 1 100.

A table shows the following test scores: 55, 62, 70, 70, 85, 90. What is the median score?

Answer: 70

With 6 values, median = average of 3rd and 4th values = (70 + 70)/2 = 70.

A graph shows two lines: one for income and one for expenses. The business makes a profit when:

Answer: The income line is above the expenses line

Profit occurs when income exceeds expenses, i.e., when the income line lies above the expenses line.

A table shows production costs: fixed R5 000 and R12 per unit. If 300 units are produced, the total cost is:

Answer: R8 600

Total cost = fixed + variable = R5 000 + (300 × R12) = R5 000 + R3 600 = R8 600.

A pie chart shows that 3/8 of a class prefers online learning. In a class of 240, how many prefer online learning?

Answer: 90

3/8 × 240 = 90 learners prefer online learning.

Two bar charts use different y-axis scales to display the same data. Chart A makes the difference look large; Chart B makes it look small. This is an example of:

Answer: A misleading graph

Changing the y-axis scale can visually exaggerate or minimise differences, creating a misleading impression of the data.