It is currently 20 Nov 2017, 09:03

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# The standard deviation of a certain set of data is 3. If 20

Author Message
Senior Manager
Joined: 21 Jun 2004
Posts: 336

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

The standard deviation of a certain set of data is 3. If 20 [#permalink]

### Show Tags

12 Nov 2004, 06:55
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

The standard deviation of a certain set of data is 3. If 20 is 2 standard deviations away from the mean, which of the following values could be the mean of the set of data?

A. 14
B. 20
C. 24
D. 18
E. 25
_________________

510 on my first GMAT. 610 on second GMAT.!
The struggle continues.

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

VP
Joined: 30 Sep 2004
Posts: 1480

Kudos [?]: 426 [0], given: 0

Location: Germany

### Show Tags

12 Nov 2004, 07:02
is it a) ?

2 SD away from the mean means 2 * 3 = 6 means 20 + 6 = 26 or 20 - 6 = 14; so it is a)

Kudos [?]: 426 [0], given: 0

CIO
Joined: 09 Mar 2003
Posts: 460

Kudos [?]: 73 [0], given: 0

### Show Tags

12 Nov 2004, 08:38
christoph wrote:
is it a) ?

2 SD away from the mean means 2 * 3 = 6 means 20 + 6 = 26 or 20 - 6 = 14; so it is a)

definately. it's a

Kudos [?]: 73 [0], given: 0

Senior Manager
Joined: 19 Oct 2004
Posts: 315

Kudos [?]: 109 [0], given: 0

Location: Missouri, USA

### Show Tags

12 Nov 2004, 11:56
should be A...
20-3*2=14...
_________________

Let's get it right!!!!

Kudos [?]: 109 [0], given: 0

Manager
Joined: 28 Aug 2004
Posts: 205

Kudos [?]: 2 [0], given: 0

### Show Tags

15 Nov 2004, 23:56
The way I see it is that number 20 has a lower standard deviation than that of the whole set of data . So it has to be closer to the mean. Among the choices, the closest would a mean of 18.

Kudos [?]: 2 [0], given: 0

Manager
Joined: 28 Aug 2004
Posts: 205

Kudos [?]: 2 [0], given: 0

### Show Tags

17 Nov 2004, 01:04
What's the OA for this one guys?

Kudos [?]: 2 [0], given: 0

Senior Manager
Joined: 21 Jun 2004
Posts: 336

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

### Show Tags

17 Nov 2004, 06:43
Sorry for getting back so late.
OA is A.
This is a Deltacourse question.
_________________

510 on my first GMAT. 610 on second GMAT.!
The struggle continues.

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

17 Nov 2004, 06:43
Display posts from previous: Sort by

# The standard deviation of a certain set of data is 3. If 20

Moderator: chetan2u

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.