GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 25 Jan 2020, 09:19

### 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

# Arithmetic mean and standard deviation of a certain normal

Author Message
TAGS:

### Hide Tags

Manager
Joined: 07 Feb 2010
Posts: 113
Arithmetic mean and standard deviation of a certain normal  [#permalink]

### Show Tags

Updated on: 19 Feb 2012, 22:25
1
4
00:00

Difficulty:

5% (low)

Question Stats:

92% (00:32) correct 8% (00:53) wrong based on 287 sessions

### HideShow timer Statistics

Arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5. What value is exactly 2 standard deviations less than the mean?
(A) 10.5
(B) 11
(C) 11.5
(D) 12
(E) 12.5

Originally posted by anilnandyala on 02 Nov 2010, 05:32.
Last edited by Bunuel on 19 Feb 2012, 22:25, edited 1 time in total.
Edited the question
Math Expert
Joined: 02 Sep 2009
Posts: 60647
Re: the arthimetic and standard deviation  [#permalink]

### Show Tags

02 Nov 2010, 05:49
Original question is:

Arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5. What value is exactly 2 standard deviations less than the mean?
(A) 10.5
(B) 11
(C) 11.5
(D) 12
(E) 12.5

The value which is exactly two SD below the mean is: mean-2*SD=13.5-2*1.5=10.5.

_________________
Manager
Joined: 10 Sep 2010
Posts: 107
Re: the arthimetic and standard deviation  [#permalink]

### Show Tags

02 Nov 2010, 14:32
Is this question really a 600-700 level?
What is the source?
Thanks
Non-Human User
Joined: 09 Sep 2013
Posts: 14011
Re: Arithmetic mean and standard deviation of a certain normal  [#permalink]

### Show Tags

05 Oct 2019, 23:39
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.
_________________
Re: Arithmetic mean and standard deviation of a certain normal   [#permalink] 05 Oct 2019, 23:39
Display posts from previous: Sort by