What Data Interpretation Questions Test
- Tables and bar/line graphs — reading and comparing
- Pie charts — share, angle and value conversions
- Caselet/mixed DI — data given in prose
- Percentage change and ratio across data points
- Averages and totals across categories
Question bank coverage by sub-pattern
How Data Interpretation Appears in RRB NTPC
Data Interpretation is part of the Mathematics section (30% of the RRB NTPC syllabus).
Data Interpretation Solved Examples for RRB NTPC
3 exam-pattern data interpretation questions from the practice bank, each with a full solution.
A scatter plot displays the number of ice cream cones sold versus the daily high temperature. If most of the points are clustered in the upper right corner, what does this suggest?
- A.Ice cream sales decrease with temperature.
- B.Ice cream sales increase with temperature.Correct
- C.There is no relationship between ice cream sales and temperature.
- D.Ice cream sales are constant regardless of temperature.
Solution
If the points are clustered in the upper right corner, it means that high temperatures are associated with high ice cream sales. This suggests a positive correlation, indicating that ice cream sales increase with temperature.
A bar graph shows the number of students who passed an exam in 4 consecutive years. Year 1: 120, Year 2: 150, Year 3: 180, Year 4: 210. What is the percentage increase in the number of students who passed from Year 1 to Year 4?
- A.50%
- B.60%
- C.70%
- D.75%Correct
Solution
The increase in the number of students is 210 - 120 = 90. The percentage increase is (90 / 120) * 100 = 75%.
A multi-line graph shows the number of male and female employees in a company over a period of 5 years. If the total number of employees is the sum of male and female employees, in what percentage of the years was the number of female employees greater than 50% of the total number of employees? [Assume the graph shows: Yr1: M=40, F=60; Yr2: M=45, F=55; Yr3: M=50, F=50; Yr4: M=55, F=45; Yr5: M=60, F=40]
- A.20%
- B.40%Correct
- C.60%
- D.80%
Solution
Yr1: Total=100, Female%=60%; Yr2: Total=100, Female%=55%; Yr3: Total=100, Female%=50%; Yr4: Total=100, Female%=45%; Yr5: Total=100, Female%=40%. Female employees were greater than 50% in 2 out of 5 years. 2/5 = 40%.
Data Interpretation — Frequently Asked Questions
What actually makes DI sets slow?
Calculation, not comprehension. The data is simple; the marks go to whoever computes percentages and ratios fastest — which is why percentage fluency is a prerequisite.
Should I attempt every question in a DI set?
Usually one question per set is deliberately calculation-heavy. Attempt the direct ones first and return to the heavy one only if time permits.
How many Data Interpretation practice questions does Parikshala have for RRB NTPC?
224 exam-pattern Data Interpretation questions for RRB NTPC Mathematics, each with a step-by-step solution. Practice is free — no sign-up needed to start.