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GMAT Statistics Lesson Video
Includes definition of average and how to compute average? How to compute sum if average is known? How to compute the number of terms if sum and average are known?
Introduces with illustrative example a standard framework that can be used to solve questions that test concepts in average.
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[@sachinsavailable]

Bhaskar sir, Thank you for posting outstanding videos. I Appreciate it sincerely and I am sure other too.
Regards

[@Wizako]

Sachin. Thanks for your feedback and words of appreciation.

[@ashishsinha9035]

Nice

[@Wizako]

Thank you! Cheers!

[@bahaarrao4616]

I have a doubt in the class example. The question days that the average of class A and B is 16 years and that of class A is 20 years. So in this case (a) I.e. average of class B comes out to be 4 years and sum of students of class be to be 160 rather that 560.
Why is my approach incorrect ?

[@Rocloka]

We know that 20*20 = 400 which is the sum of A. We also know that the average of A and B is 16. This means that (sum of A + sum of B)/(quant of A + quant of B)=16. We have the values for all but the sum of B. (400+B)/(20+40)=16 => (400+B)/60=16 => 400+B=60*16 => B=60*16-400=560. 560/40=14 which is the answer to the question of the average age of class B.