Events & Promotions
|
|
GMAT Club Daily Prep
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
24 Oct 2014, 12:27
Kudos
Bookmarks
Dear Experts,
Could you pls explain Weight average mean. Few people solve it using number line. I always get confuse with number line approach.
for example.
750———–o———–o———–X———–780
Thanks,
Ammu
Could you pls explain Weight average mean. Few people solve it using number line. I always get confuse with number line approach.
for example.
750———–o———–o———–X———–780
Thanks,
Ammu
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
25 Oct 2014, 03:07
Kudos
Bookmarks
Let's say there are 5 students with a score of 750 and 8 students with a score of 780. And if their combined average score for the class of 13 students is m, then the relationship between the quantities is as follows:
(780-m)/(m-750) = 5/8
Note 780 -m is the distance of the combined average from one end and m-750 is the distance from the other end. These quantities are in the same ratio as the weights on the opposite ends(here the number of students).
And the above equation is merely a rearrangement of the basic definition of the weighted average, which in this case would give us the average explicitly:
m = [8(780) + 5(750)]/[8+5]
Try rewriting this above equation in to the form of the first equation.
Cheers,
Dabral
(780-m)/(m-750) = 5/8
Note 780 -m is the distance of the combined average from one end and m-750 is the distance from the other end. These quantities are in the same ratio as the weights on the opposite ends(here the number of students).
And the above equation is merely a rearrangement of the basic definition of the weighted average, which in this case would give us the average explicitly:
m = [8(780) + 5(750)]/[8+5]
Try rewriting this above equation in to the form of the first equation.
Cheers,
Dabral
26 Oct 2014, 20:47
Kudos
Bookmarks
ammuseeru
The number line approach boils down to this formula:
w1/w2 = (A2 - Aavg)/(Aavg - A1)
It has the efficiency of the number line approach but not its complication.
This is explained in detail here: https://www.gmatclub.com/forum/veritas-prep-resource-links-no-longer-available-399979.html#/2011/03 ... -averages/
