GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Jun 2019, 12:59

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.

Close

Request Expert Reply

Confirm Cancel

A researcher computed the mean, the median, and the standard

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 03 Mar 2007
Posts: 157
A researcher computed the mean, the median, and the standard  [#permalink]

Show Tags

New post 17 Mar 2007, 12:51
3
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

77% (00:23) correct 23% (00:39) wrong based on 270 sessions

HideShow timer Statistics

A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A) The mean only
B) The median only
C) The standard deviation only
D) The mean and the median
E) The mean and the standard deviation

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-researcher-computed-the-mean-the-median-and-the-standard-134893.html
SVP
SVP
User avatar
Joined: 01 May 2006
Posts: 1722
Re: A researcher computed the mean, the median, and the standard  [#permalink]

Show Tags

New post 17 Mar 2007, 13:03
1
D it is yes :)

A standart deviation never changes when a constant is added to all elements of a same set :)

The construction of the standart deviation is made on the idea that we observe how far the data are from the average. Thus, the distance will always remain the same if we add a constant to every data present in the set.

To make an analogy, we can imagine an spacecraft. All dimensions of it remain the same no matter where we are. The height and the width will be exactly the same if we are at 100 km from the surface of the earth or at 2 000 km from it. The position of its center of gravity will change compared between the 2 distance (it's the average) but all parts of it will keep the same distance to its center of gravity (similarly to the standart deviation).

:)
Manager
Manager
avatar
Joined: 03 Mar 2007
Posts: 157
Re: A researcher computed the mean, the median, and the standard  [#permalink]

Show Tags

New post 17 Mar 2007, 17:37
1
A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A) The mean only
B) The median only
C) The standard deviation only
D) The mean and the median
E) The mean and the standard deviation

Official Guide 12 Question

GMAT Official Guide 12

Question: 12
Page: 145
Difficulty: 700

Find All Official Guide Questions

Video Explanations:
Spoiler: :: Watch video

Spoiler: :: OA
D
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 55732
Re: A researcher computed the mean, the median, and the standard  [#permalink]

Show Tags

New post 08 Dec 2014, 03:09
1
salr15 wrote:
A researcher computed the mean, the median, and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

A) The mean only
B) The median only
C) The standard deviation only
D) The mean and the median
E) The mean and the standard deviation


If we add or subtract a constant to each term in a set the standard deviation will not change..

If we add (or subtract) a constant to each term in a set the mean and the median will increase (decrease) by the value of that constant.

Answer: D.

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-researcher-computed-the-mean-the-median-and-the-standard-134893.html
_________________
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 11398
Re: A researcher computed the mean, the median, and the standard  [#permalink]

Show Tags

New post 18 Aug 2018, 03:08
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: A researcher computed the mean, the median, and the standard   [#permalink] 18 Aug 2018, 03:08
Display posts from previous: Sort by

A researcher computed the mean, the median, and the standard

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


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