NBT Data Interpretation & Analysis 3

Question 1

A line graph shows monthly sales (units): Jan = 500, Feb = 600, Mar = 720, Apr = 864. If the same growth rate continues, what will May's sales be?

Accepted Answer

1,037

Answer

Each month grows by a factor of 1.2 (20%); May = 864 × 1.2 = 1,036.8 ≈ 1,037.

Question 2

A line graph shows a city's population: Year 1 = 50,000; Year 2 = 55,000; Year 3 = 60,500; Year 4 = 66,550. Which type of growth does this represent?

Accepted Answer

Exponential

Answer

Each year's population is 1.10× the previous year, indicating a constant growth rate — exponential growth.

Question 3

A distance-time graph shows a car traveling 120 miles in 2 hours, stopping for 30 minutes, then traveling 90 miles in 1.5 hours. What is the car's average speed for driving time only?

Accepted Answer

60 mph

Answer

Total driving distance = 210 miles; total driving time = 3.5 hours; average speed = 210 / 3.5 = 60 mph.

Question 4

A line graph shows annual inflation rates: Year 1 = 2.5%, Year 2 = 3.0%, Year 3 = 3.8%, Year 4 = 2.9%, Year 5 = 2.1%. Between which consecutive years was the increase in the inflation rate greatest?

Accepted Answer

Year 2 to 3

Answer

Year 1→2: +0.5pp; Year 2→3: +0.8pp; Year 3→4: −0.9pp; Year 4→5: −0.8pp — Year 2 to 3 shows the largest increase.

Question 5

A scatter plot shows a positive correlation between study hours (x) and exam scores (y). The trend line equation is y = 5x + 40. What score is predicted for a student who studied 8 hours?

Accepted Answer

80

Answer

y = 5(8) + 40 = 40 + 40 = 80.

(NBT) National Benchmark Test Practice Test

(NBT) National Benchmark Test Practice Test

NBT Data Interpretation & Analysis 3