Last visit was: 06 Apr 2025, 03:26 It is currently 06 Apr 2025, 03:26
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
PREVIOUS TOPIC
NEXT TOPIC

Tha standard deviation

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 31475
Own Kudos [?]: 37667 [0]
Given Kudos: 26234
Send PM
Tha standard deviation [#permalink] New post   25 Oct 2021, 05:34
Expert Reply
00:00

Question Stats:

100% (00:11) correct 0% (00:00) wrong based on 9 sessions

Hide Show timer Statistics

Quantity A
Quantity B
The standard deviation of 4,6,8,10,12
The standard deviation of 8,8,8,8,8



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.
ShowHide Answer
Official Answer
A
Most Helpful Community Reply
User avatar
P
GreenlightTestPrep
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12345 [1]
Given Kudos: 136
Send PM

Top Member of the Month
Re: Tha standard deviation [#permalink] New post   25 Oct 2021, 08:05
1
Carcass wrote:
Quantity A
Quantity B
The standard deviation of 4,6,8,10,12
The standard deviation of 8,8,8,8,8



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.


Key property #1: The standard deviation of a set of numbers is always greater than or equal to 0
Key property #2: If the numbers in a set are all identical, and the standard deviation of that set is zero

By property #2, the standard deviation of {8,8,8,8,8} is 0
By properties #1 and #2, the standard deviation of {4,6,8,10,12} is not 0, which means the standard deviation must be positive.

So, we have:
QUANTITY A: Some positive value
QUANTITY B: 0

Answer: A

RELATED VIDEO
General Discussion
avatar
S
KurtMeyer
Manager
Manager
Joined: 13 Sep 2024
Posts: 112
Own Kudos [?]: 29 [1]
Given Kudos: 6
Send PM
Re: Tha standard deviation [#permalink] New post   07 Nov 2024, 13:57
1
Because of which standard deviation cannot be less than zero, and the series all consisting of same numbers have 0 standard deviation, the answer A does make sense. Same numbers have zero standard deviation. Any series that has at least one different number will have a standard deviation greater than zero.
Prep Club for GRE Bot
gmatclubot
Re: Tha standard deviation [#permalink]
07 Nov 2024, 13:57
Moderators:
adewale223
GRE Instructor
108 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1131 posts
VibhuAnurag
GRE Instructor
234 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact