Average is one of the most basic and scoring topics in the Quantitative Aptitude section of bank and insurance exams. Questions from this topic are asked regularly because they test your understanding of numbers and your ability to apply simple logic. If you prepare this chapter well, you can easily score marks with minimum time and effort. In this blog, you will learn the importance of average questions, basic concepts and formulas, types of questions asked in exams, common mistakes, and a smart preparation strategy.
Download Free PDF of Average Questions for OICL AO Exam 2025
In this section, we are providing a free PDF of the Average Questions for the OICL AO Exam. The PDF is curated by our experts after analysing trends from previous years.
Basic Concept of Average
Average is defined as the sum of all observations divided by the number of observations.
Average = Sum of observations ÷ Number of observations
You should remember that the average represents the central value of a group and helps compare quantities easily.
Important Formulas You Must Remember
You should revise these formulas regularly.
Average = Sum of observations ÷ Number of observations
Sum of observations = Average × Number of observations
If the average changes, the change in sum can be calculated as
Change in Sum = Change in Average × Number of observations
These formulas are very useful in solving exam-level questions quickly.
Types of Average Questions Asked in Exams
Simple Average Questions
These questions involve direct calculation of average.
Example
If the average of 5 numbers is 20, you should calculate the total sum by multiplying average with the number of values.
Average Based on Replacement of Numbers
In such questions, one or more values are replaced, and you need to find the new average.
Example
If the average of 10 numbers is 15 and one number is replaced by another, you should calculate the change in sum first.
Average Age Questions
These questions are based on the average age of a group of people.
Example
If the average age of 5 people is given and a new person joins or leaves the group, you should adjust the sum accordingly.
Average Speed Questions
These questions involve calculating average speed over different distances or times.
You should remember that average speed is total distance divided by total time and not the simple average of speeds.
Combined Average Questions
In combined average questions, the averages of two or more groups are given.
Example
If the average of one group and another group is known, you should calculate the combined average using total sum and total number of elements.
How to Solve Average Questions in the Exam
You should follow a clear and systematic approach.
• You should identify the number of observations clearly
• You should calculate the total sum using average
• You should avoid direct addition whenever possible
• You should use change in average concept for replacement questions
This approach helps save time and avoid unnecessary calculations.
Common Mistakes to Avoid
• Calculating simple average instead of weighted average
• Forgetting to multiply average with number of values
• Applying wrong logic in average speed questions
• Making calculation errors due to haste
You should practise enough questions to eliminate these mistakes.
Preparation Strategy for Average Questions
To master average questions, you should follow a disciplined strategy.
• Revise basic formulas daily
• Practise 15 to 20 average questions regularly
• Focus on age and replacement-based questions
• Analyse your mistakes after mock tests
• Revise shortcut methods before the exam
With consistent practice, you can solve these questions very quickly.
Tips to Score Full Marks
• Always convert average into total sum first
• Use difference method for replacement questions
• Read the question carefully before solving
• Focus on accuracy rather than speed initially
Final Words
Average questions are easy, scoring, and less time-consuming in bank and insurance exams. If your concepts are clear and your approach is systematic, you can easily convert this topic into a strength. You should not ignore this chapter, as it offers sure-shot marks and helps improve your overall score.
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