Weighted Average

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Abdulla: Master | Next Rank: 500 Posts; Posts: 328; Joined: Thu Aug 07, 2008 5:25 pm; Location: Philadelphia; Thanked: 4 times; GMAT Score:550

by Abdulla » Fri Nov 27, 2009 5:15 pm

OA is C

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Abdulla

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Source: Beat The GMAT — Data Sufficiency | Fri Nov 27, 2009 5:15 pm

adam15: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Mon May 12, 2008 12:26 pm; Thanked: 3 times

by adam15 » Sun Nov 29, 2009 10:33 am

the answer is C.
Would you please tell me where you bought this GMAT practice.

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

by mehravikas » Sun Nov 29, 2009 3:58 pm

Answer should be C - Here's why https://www.beatthegmat.com/weighted-average-t28451.html

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mehravikas: Legendary Member; Posts: 1161; Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member; Location: Sydney; Thanked: 23 times

by mehravikas » Sun Nov 29, 2009 4:00 pm

Whats the source?

Abdulla wrote:OA is C

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Mon Nov 30, 2009 12:15 am

Here's another thread in which I discuss using a number line to understand weighted averages:

https://www.beatthegmat.com/what-fractio ... 11500.html

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course

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adamsmith2009: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Fri Mar 27, 2009 6:53 pm

by adamsmith2009 » Wed Dec 02, 2009 1:56 pm

Just want to confirm that the answer is 66% based on the weighted average method. 1 and 2 are not sufficient so if we combine:

G-----------------Avg----------------U
40 20

U/G = 40/20 = 4/2 = 4/6 or 66%

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Wed Dec 02, 2009 5:06 pm

adamsmith2009 wrote:Just want to confirm that the answer is 66% based on the weighted average method. 1 and 2 are not sufficient so if we combine:

G-----------------Avg----------------U
40 20

U/G = 40/20 = 4/2 = 4/6 or 66%

No, that's backwards.

The overall average is closer to the undergraduates, so the undergrads must carry more weight.

Well, it may be right if you're answering the wrong question

You've set up the number line and equations properly, but the question is what percent are graduate students, so the answer is 1/3, not 2/3.

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adamsmith2009: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Fri Mar 27, 2009 6:53 pm

by adamsmith2009 » Thu Dec 03, 2009 5:16 am

Ahh - I see. I had the undergraduate ratio and not the graduate. Thanks Stuart.

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