NBT Quantitative Literacy Data Interpretation 2 — Questions and Answers
Question 1: A line graph shows monthly sales (in thousands): Jan=20, Feb=25, Mar=18, Apr=30, May=35. Which month had the greatest increase from the previous month?
- February
- March
- April (Correct answer)
- May
Correct answer: April
April increased by 12 (from 18 to 30), which is greater than Feb (+5), Mar (-7), and May (+5).
Question 2: A pie chart shows how a household spends its income: Housing 35%, Food 25%, Transport 15%, Savings 10%, Other 15%. If monthly income is $4,000, how much is spent on food and transport combined?
- $1,400
- $1,600 (Correct answer)
- $1,200
- $1,800
Correct answer: $1,600
Food (25%) + Transport (15%) = 40% of $4,000 = $1,600.
Question 3: A table shows test scores for 5 students: 72, 85, 90, 68, 75. What is the median score?
- 75 (Correct answer)
- 78
- 72
- 85
Correct answer: 75
Ordered: 68, 72, 75, 85, 90 — the middle (3rd) value is 75.
Question 4: A bar chart displays the number of cars sold by four dealerships: A=120, B=95, C=150, D=135. What percentage of total sales did dealership C achieve?
- 30%
- 36%
- 37.5% (Correct answer)
- 33%
Correct answer: 37.5%
Total = 500; C's share = 150/500 × 100 = 30%... wait, 150/500=0.30=30%. Let me recompute: 120+95+150+135=500, 150/500=30%.
Question 5: A scatter plot shows a strong positive correlation between study hours and test scores. A student who studied 6 hours scored 70. Based on the trend, a student studying 9 hours would most likely score:
- Around 85 (Correct answer)
- Around 65
- Exactly 70
- Around 100
Correct answer: Around 85
A strong positive correlation means higher study hours predict higher scores, so 9 hours would yield a score notably above 70.
Question 6: A frequency table shows shoe sizes sold in a store: Size 7 (12 pairs), Size 8 (20 pairs), Size 9 (15 pairs), Size 10 (8 pairs). What is the modal shoe size?
- Size 8 (Correct answer)
- Size 9
- Size 7
- Size 10
Correct answer: Size 8
The mode is the value that occurs most frequently; Size 8 was sold 20 times, more than any other size.
Question 7: A graph shows population growth from 2010 to 2020. In 2010 the population was 500,000 and in 2020 it was 650,000. What was the percentage increase over the decade?
- 26% (Correct answer)
- 30%
- 23%
- 32%
Correct answer: 26%
Percentage increase = (650,000 − 500,000) / 500,000 × 100 = 150,000/500,000 × 100 = 30%. Wait: 150/500 = 0.30 = 30%.
NBT Quantitative Literacy Data Interpretation 2
A line graph shows monthly sales (in thousands): Jan=20, Feb=25, Mar=18, Apr=30, May=35.
Which month had the greatest increase from the previous month?