Data Interpretation Quiz: Tables, Bar, Line and Pie Charts

Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.

1. A company sold the following numbers of laptops (in thousands): 2019 – 40, 2020 – 50, 2021 – 45, 2022 – 60, 2023 – 75. What was the percentage increase in sales from 2022 to 2023?

   • 20%
   • 25%
   • 15%
   • 30%

   Answer: 25%. Increase = 75 − 60 = 15 on a base of 60: 15/60 × 100 = 25%. Always divide by the earlier year.

2. A company sold the following numbers of laptops (in thousands): 2019 – 40, 2020 – 50, 2021 – 45, 2022 – 60, 2023 – 75. What were the average annual sales over the five years?

   • 54 thousand
   • 52 thousand
   • 55 thousand
   • 50 thousand

   Answer: 54 thousand. Total = 40 + 50 + 45 + 60 + 75 = 270 thousand; 270 ÷ 5 = 54 thousand.

3. A company sold the following numbers of laptops (in thousands): 2019 – 40, 2020 – 50, 2021 – 45, 2022 – 60, 2023 – 75. In which year was the percentage growth over the previous year the highest?

   • 2020
   • 2023
   • 2021
   • 2022

   Answer: 2022. Growth: 2020 25%, 2021 −10%, 2022 15/45 = 33.3%, 2023 25%. The 2022 rise is the highest because its base (45) was small.

4. A family's monthly budget of Rs 60,000 is shown in a pie chart: Food 30%, Rent 25%, Education 15%, Transport 10%, Savings 20%. By how much does the spending on Rent exceed the spending on Transport?

   • Rs 6,000
   • Rs 7,500
   • Rs 9,000
   • Rs 12,000

   Answer: Rs 9,000. Difference = 25% − 10% = 15% of Rs 60,000 = Rs 9,000.

5. A family's monthly budget of Rs 60,000 is shown in a pie chart: Food 30%, Rent 25%, Education 15%, Transport 10%, Savings 20%. What is the central angle of the Education sector in the pie chart?

   • 54°
   • 45°
   • 60°
   • 36°

   Answer: 54°. Each 1% is 3.6°, so 15% = 15 × 3.6 = 54°.

6. A family's monthly budget of Rs 60,000 is shown in a pie chart: Food 30%, Rent 25%, Education 15%, Transport 10%, Savings 20%. If the savings amount rises by 25% while the total budget stays Rs 60,000, what percentage of the budget will savings form?

   • 22.5%
   • 24%
   • 20.5%
   • 25%

   Answer: 25%. Savings = Rs 12,000; up 25% it becomes Rs 15,000, which is 15,000/60,000 = 25% of the budget.

7. A bar chart shows students in four colleges (boys, girls): P (300, 200), Q (250, 350), R (400, 100), S (150, 250). What is the ratio of the total number of students in college P to that in college S?

   • 4:5
   • 5:4
   • 3:2
   • 6:5

   Answer: 5:4. P has 300 + 200 = 500 and S has 150 + 250 = 400 students. 500:400 = 5:4.

8. A bar chart shows students in four colleges (boys, girls): P (300, 200), Q (250, 350), R (400, 100), S (150, 250). What percentage of the students in college Q are girls?

   • 41.67%
   • 55%
   • 58.33%
   • 60%

   Answer: 58.33%. Q has 600 students, of whom 350 are girls: 350/600 = 7/12 = 58.33%.

9. A bar chart shows students in four colleges (boys, girls): P (300, 200), Q (250, 350), R (400, 100), S (150, 250). By how many does the total number of boys in the four colleges exceed the total number of girls?

   • 150
   • 200
   • 250
   • 100

   Answer: 200. Boys = 300 + 250 + 400 + 150 = 1,100; girls = 200 + 350 + 100 + 250 = 900. Difference = 200.

10. A line graph shows a factory's monthly output (in tonnes): January 120, February 150, March 135, April 180. Output in April was what percentage more than in January?

    • 40%
    • 45%
    • 60%
    • 50%

    Answer: 50%. April exceeds January by 60 tonnes; 60/120 × 100 = 50%. "More than January" means January is the base.