NBT NBT Quantitative Literacy: Charts, Tables and Graphs 3

Question 1

A line graph shows electricity usage: Month 1 = 300 kWh, Month 2 = 350 kWh, Month 3 = 280 kWh. In which month was usage the lowest?

Accepted Answer

Month 3

Answer

Month 3 at 280 kWh is the lowest value among the three months.

Question 2

A pie chart shows 5 categories. If one category represents 90°, how many of this sector fit in the full pie?

Accepted Answer

4

Answer

360° ÷ 90° = 4 sectors of this size fit in a full circle.

Question 3

A table records rainfall (mm): Mon 12, Tue 8, Wed 0, Thu 15, Fri 5. What is the mean daily rainfall?

Accepted Answer

8 mm

Answer

Total = 40 mm; mean = 40/5 = 8 mm per day.

Question 4

A misleading graph uses a y-axis that starts at 950 instead of 0. A bar representing 1 000 looks twice as tall as one representing 960. What is the actual percentage difference between them?

Accepted Answer

Approximately 4%

Answer

Actual difference = 1 000 − 960 = 40; percentage = 40/960 × 100% ≈ 4.2%, not the visual 100%.

Question 5

A grouped frequency table shows scores: 40–49 (5 learners), 50–59 (12 learners), 60–69 (8 learners). How many learners scored below 60?

Accepted Answer

17

Answer

Learners in 40–49 and 50–59 = 5 + 12 = 17 learners scored below 60.

(NBT) National Benchmark Test Practice Test

(NBT) National Benchmark Test Practice Test

NBT NBT Quantitative Literacy: Charts, Tables and Graphs 3