It is currently 13 Dec 2017, 06:59

Decision(s) Day!:

CHAT Rooms | Ross R1 | Kellogg R1 | Darden R1 | Tepper R1

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 arithmetic mean and standard deviation of a certain

Author Message
TAGS:

Hide Tags

Intern
Joined: 20 Nov 2011
Posts: 2

Kudos [?]: 29 [0], given: 1

The arithmetic mean and standard deviation of a certain [#permalink]

Show Tags

15 Mar 2012, 07:29
00:00

Difficulty:

5% (low)

Question Stats:

93% (00:18) correct 7% (00:52) wrong based on 120 sessions

HideShow timer Statistics

The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?

A. 10.5
B. 11
C. 11.5
D. 12
E. 12.5
[Reveal] Spoiler: OA

Kudos [?]: 29 [0], given: 1

Math Expert
Joined: 02 Sep 2009
Posts: 42581

Kudos [?]: 135490 [0], given: 12695

Re: The arithmetic mean and standard deviation of a certain [#permalink]

Show Tags

15 Mar 2012, 07:35
MaithiliGokarn wrote:
The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5, respectively. 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 less than the mean is: mean-2*SD=13.5-2*1.5=10.5.

Similar questions to practice:
math-questions-mean-score-88502.html
statistics-question-99221.html
70-75-80-85-90-105-105-130-130-130-the-list-consists-of-50908.html

Hope it helps.
_________________

Kudos [?]: 135490 [0], given: 12695

Re: The arithmetic mean and standard deviation of a certain   [#permalink] 15 Mar 2012, 07:35
Display posts from previous: Sort by