Averages Concept for CAT Examination

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Average is mainly defined as the sum of observations divided by the number of observations. From the last 4-5 years, there have been at least 1-2 questions from the topic of the averages asked in CAT exam and we can expect this trend to continue.

Basic Formula for Average = Sum of all / number of quantities

Tricks for Fast Calculation –

When a person replaces another person then:

Age of the new person = Age of the person who left + / – (increase/decrease in average * total number of people)

When a person joins the group:

Age of new member= Previous average + / – (Increase/Decrease in average * Number of members including new member)

Here is a solved example for you to better understand the concept –

Averages for CAT Exam Preparation 2019
Averages for CAT Exam Preparation 2019

Weighted Average –

When we multiple groups whose individual averages are known then to find a combined average of all the elements we use the concept of weighted average. Here’s a solved example for you.

Averages for CAT Exam Preparation 2019
Averages for CAT Exam Preparation 2019

Hope you found this blog interesting and informative. Do check out our other blogs or visit our website to start your CAT preparation for free !

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