It is currently 14 Dec 2018, 06:58
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.

Which of the following choices lists the four datasets above

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1659 [0], given: 396

CAT Tests
Which of the following choices lists the four datasets above [#permalink] New post 29 Jul 2018, 04:44
Expert's post
00:00

Question Stats:

80% (00:31) correct 20% (00:43) wrong based on 5 sessions
Dataset W: –9, –3, 3, 9
Dataset X: 2, 4, 6, 8
Dataset Y: 100, 101, 102, 103
Dataset Z: 7, 7, 7, 7

Which of the following choices lists the four datasets above in order from least standard deviation to greatest standard deviation?

(A) W, X, Y, Z
(B) W, X, Y, Z
(C) W, X, Y, Z
(D) W, X, Y, Z
(E) W, X, Y, Z
[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

Intern
Intern
Joined: 23 Mar 2018
Posts: 7
Followers: 0

Kudos [?]: 3 [0], given: 13

Re: Which of the following choices lists the four datasets above [#permalink] New post 06 Aug 2018, 07:27
The five answer choices are the same. Could you please clarify the right answer?
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1659 [0], given: 396

CAT Tests
Re: Which of the following choices lists the four datasets above [#permalink] New post 12 Aug 2018, 16:16
Expert's post
Explanation

Standard deviation is a measure of how “spread out” the numbers in a set are—in other words, how far are the individual data points from the average of all of the data points? The GRE
will not ask you to calculate standard deviation—in problems like this one, you will be able to eyeball which sets are more spread out and which are less spread out.

Since dataset Z’s members are identical, the standard deviation is zero. Zero is the smallest possible standard deviation for any set, so it must be the smallest here. You can eliminate answer choices (A), (B), and (C). Dataset Y’s members have a spread of 1 between each number, dataset X’s members are 2 away from each other, and dataset W’s members are 6 away from each other, so dataset Y has the next-smallest standard deviation (note that this is enough to eliminate answer choice (E) and choose answer choice (D)).

The correct answer is (D) Z, Y, X, W.
_________________

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: 09 Nov 2018
Posts: 75
Followers: 0

Kudos [?]: 5 [0], given: 1

CAT Tests
Re: Which of the following choices lists the four datasets above [#permalink] New post 18 Nov 2018, 16:20
sandy wrote:
Dataset W: –9, –3, 3, 9
Dataset X: 2, 4, 6, 8
Dataset Y: 100, 101, 102, 103
Dataset Z: 7, 7, 7, 7

Which of the following choices lists the four datasets above in order from least standard deviation to greatest standard deviation?

(A) W, X, Y, Z
(B) W, X, Y, Z
(C) W, X, Y, Z
(D) W, X, Y, Z
(E) W, X, Y, Z


Please fix the answer choices; all are same right now.
Re: Which of the following choices lists the four datasets above   [#permalink] 18 Nov 2018, 16:20
Display posts from previous: Sort by

Which of the following choices lists the four datasets above

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.