Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

From wiki
In mathematics, an average, mean, or central tendency of a data set refers to a measure of the "middle" or "expected" value of the data set.

Average or i wud like to call it presently' central tendency' always refers to a set of data ...i.e average finds the central tendency of the set So average of set will keep on changing if 'new ' elements are added.

When u take 10,20 its average is 15,then you added 30 to the set..it becomes 20..The central tendency of the set in this case increases...as new element is introduced. In short,Average always refers to a set ...if you reduce/increase the number of elements definitely the value will change.

If we take individual values as 10,20 and take their av = 15

and the rest 3 values 30,40,50 and avg of these is = 40

So the group average of S {10,20,30,40,50} = 30 is not equal to the sum of individual averages 15+40 = 55 or even the av of the values 55/2 =27.5

Whats the deal here? Explanations needed please

If a1 is average of set of n1, a2 is average of set of n2, then total average a = (a1n1+a2n2)/(n1+n2)
in this case, a = (15*2+40*3)/(2+3) => 150/5 => 30

If we take individual values as 10,20 and take their av = 15

and the rest 3 values 30,40,50 and avg of these is = 40

So the group average of S {10,20,30,40,50} = 30 is not equal to the sum of individual averages 15+40 = 55 or even the av of the values 55/2 =27.5

Whats the deal here? Explanations needed please

If a1 is average of set of n1, a2 is average of set of n2, then total average a = (a1n1+a2n2)/(n1+n2) in this case, a = (15*2+40*3)/(2+3) => 150/5 => 30

Hey everyone, today’s post focuses on the interview process. As I get ready for interviews at Kellogg and Tuck (and TheEngineerMBA ramps up for his HBS... ...

I couldn’t help myself but stay impressed. young leader who can now basically speak Chinese and handle things alone (I’m Korean Canadian by the way, so...