It is currently 20 Nov 2018, 11:26
My Tests

Close

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

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.

The graph represents the normally distributed scores on a te

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4721
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1625 [0], given: 389

CAT Tests
The graph represents the normally distributed scores on a te [#permalink] New post 29 Jul 2018, 04:39
Expert's post
00:00

Question Stats:

27% (00:55) correct 72% (00:42) wrong based on 11 sessions
Attachment:
Capture.PNG
Capture.PNG [ 61.08 KiB | Viewed 321 times ]


The graph represents the normally distributed scores on a test. The shaded area represents approximately 68% of the scores.

Quantity A
Quantity B
The mean score on the test
\(550\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Manager
Manager
Joined: 27 Feb 2017
Posts: 150
Followers: 0

Kudos [?]: 40 [0], given: 15

Re: The graph represents the normally distributed scores on a te [#permalink] New post 05 Aug 2018, 14:18
some one please explaing? I thought they would be the same
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1184
Followers: 44

Kudos [?]: 1058 [0], given: 6

CAT Tests
Re: The graph represents the normally distributed scores on a te [#permalink] New post 05 Aug 2018, 14:38
Expert's post
sandy wrote:
Attachment:
Capture.PNG


The graph represents the normally distributed scores on a test. The shaded area represents approximately 68% of the scores.

Quantity A
Quantity B
The mean score on the test
\(550\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.


Given: The shaded area represents approximately 68% of the scores.
In other words, 68% of the area under the curve is shaded.
However, even though it LOOKS like the shaded area is SYMMETRICAL about the mean, we aren't told that. So we cannot assume that that is the case.

If the shaded area IS symmetrical about the mean,....
Image
....then the mean is 550, in which case the two quantities are EQUAL.


However, it could also be the case that the shaded area is NOT symmetrical about the mean
Image
For example, in the above diagram, 68% of the area under the curve is shaded. HOWEVER, it is not symmetrical about the mean.
In this case, the mean could be something like 530, in which case Quantity B is greater than Quantity A

Answer: D

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for our free GRE Question of the Day emails

Manager
Manager
Joined: 27 Feb 2017
Posts: 150
Followers: 0

Kudos [?]: 40 [0], given: 15

Re: The graph represents the normally distributed scores on a te [#permalink] New post 08 Aug 2018, 04:58
GreenlightTestPrep wrote:
sandy wrote:
Attachment:
Capture.PNG


The graph represents the normally distributed scores on a test. The shaded area represents approximately 68% of the scores.

Quantity A
Quantity B
The mean score on the test
\(550\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.


Given: The shaded area represents approximately 68% of the scores.
In other words, 68% of the area under the curve is shaded.
However, even though it LOOKS like the shaded area is SYMMETRICAL about the mean, we aren't told that. So we cannot assume that that is the case.

If the shaded area IS symmetrical about the mean,....
Image
....then the mean is 550, in which case the two quantities are EQUAL.


However, it could also be the case that the shaded area is NOT symmetrical about the mean
Image
For example, in the above diagram, 68% of the area under the curve is shaded. HOWEVER, it is not symmetrical about the mean.
In this case, the mean could be something like 530, in which case Quantity B is greater than Quantity A

Answer: D

Cheers,
Brent


Hi, thanks for the explanation. Could you also please guide me as to which chapter/section this question comes under? I am pretty weak at questions like this and could brush up on the basics for this.
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4721
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1625 [0], given: 389

CAT Tests
Re: The graph represents the normally distributed scores on a te [#permalink] New post 08 Aug 2018, 14:07
Expert's post
This question is under statistics.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Re: The graph represents the normally distributed scores on a te   [#permalink] 08 Aug 2018, 14:07
Display posts from previous: Sort by

The graph represents the normally distributed scores on a te

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.