Find all School-related info fast with the new School-Specific MBA Forum

It is currently 01 Oct 2014, 06:38

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

During certain 5 months, the highest month sales value is 5.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 10 Dec 2004
Posts: 274
Followers: 1

Kudos [?]: 24 [0], given: 0

During certain 5 months, the highest month sales value is 5. [#permalink] New post 13 May 2005, 05:24
During certain 5 months, the highest month sales value is 5. What is the deviation of 5 sales values?
1) Range =0
2) Mean=5
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 13 May 2005, 10:16
It is D.
If mean=max value it means that all values are equal and STD deviation is 0
Manager
Manager
avatar
Joined: 05 May 2005
Posts: 92
Location: Kyiv, Ukraine
Followers: 1

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

 [#permalink] New post 13 May 2005, 14:32
guys, could you please give a formula (explain a little more) for Standard Deviation?

thanks.
VP
VP
User avatar
Joined: 25 Nov 2004
Posts: 1498
Followers: 6

Kudos [?]: 31 [0], given: 0

 [#permalink] New post 13 May 2005, 20:23
MA wrote:
A.
thats a blunder. :drunk
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 14 May 2005, 05:56
Dan wrote:
thearch wrote:
It is D.
If mean=max value it means that all values are equal and STD deviation is 0


Should be B then?


I think that all you have to know about Standard deviation is that it is a measure of dispersion around the mean value.
If the range is 0, it means that MAX-MIN=0, or MAX value=Min Value. The deviation is obviously 0.
If the mean is = to MAX value, or = to the MIN value, then the set is composed of all equal numbers (nothing would have changed if the stem had said: "the least value is 5, and the mean is 5).
Hope it's sufficiently clear.
Manager
Manager
avatar
Joined: 28 Aug 2004
Posts: 205
Followers: 1

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

 [#permalink] New post 14 May 2005, 06:38
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 14 May 2005, 06:46
Dan wrote:
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.


you're almost right.
In the first case, range is not 0, it is 4. (Max value is 5 and min value is 1)
In this case, range can be 0 only with all 5, as you say in your second example.

Last edited by thearch on 18 May 2005, 06:12, edited 1 time in total.
CIO
CIO
User avatar
Joined: 09 Mar 2003
Posts: 466
Followers: 1

Kudos [?]: 26 [0], given: 0

 [#permalink] New post 17 May 2005, 11:03
thearch wrote:
Dan wrote:
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.


you're almost right.
In the first case, range is not 0, it is 4. (Max value is 5 and min value is 1)
In this case, range can be 0 only with -5 in the set, since 5 is the max value, or with all 5, as you say in your second example. But sales can't be negative, and the first option (with -5 in the set) is not possible.


I definately agree not only with the answer, but also the approach. nice explanation.
Manager
Manager
User avatar
Joined: 04 Mar 2005
Posts: 107
Location: NYC
Followers: 2

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

Re: Deviation [#permalink] New post 17 May 2005, 11:17
pb_india wrote:
During certain 5 months, the highest month sales value is 5. What is the deviation of 5 sales values?
1) Range =0
2) Mean=5


'D'

Stmt 1 : Range = 0 -> Std = 0
Stmt 2 = Mean = 5 -> Mean = Highest sales value -> Std = 0
Director
Director
User avatar
Joined: 18 Apr 2005
Posts: 551
Location: Canuckland
Followers: 1

Kudos [?]: 7 [0], given: 0

 [#permalink] New post 18 May 2005, 01:52
A very nice problem, thanks india_pb

Is 'deviation' a normal name for 'standard deviation'?
SVP
SVP
User avatar
Joined: 05 Apr 2005
Posts: 1736
Followers: 3

Kudos [?]: 33 [0], given: 0

 [#permalink] New post 18 May 2005, 05:53
ian7777 wrote:
thearch wrote:
Dan wrote:
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.


you're almost right.
In the first case, range is not 0, it is 4. (Max value is 5 and min value is 1)
In this case, range can be 0 only with [b]-5 in the set, since 5 is the max value[/b], or with all 5, as you say in your second example. But sales can't be negative, and the first option (with -5 in the set) is not possible.


I definately agree not only with the answer, but also the approach. nice explanation.


but i disagree with thearch's explanation that the range is zero if -5 is in the set. the only possible case to have zero is identical numbers.
CIO
CIO
User avatar
Joined: 09 Mar 2003
Posts: 466
Followers: 1

Kudos [?]: 26 [0], given: 0

 [#permalink] New post 18 May 2005, 05:57
HIMALAYA wrote:
ian7777 wrote:
thearch wrote:
Dan wrote:
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.


you're almost right.
In the first case, range is not 0, it is 4. (Max value is 5 and min value is 1)
In this case, range can be 0 only with [b]-5 in the set, since 5 is the max value[/b], or with all 5, as you say in your second example. But sales can't be negative, and the first option (with -5 in the set) is not possible.


I definately agree not only with the answer, but also the approach. nice explanation.


but i disagree with thearch's explanation that the range is zero if -5 is in the set. the only possible case to have zero is identical numbers.


Yes, you're right of course. I wasn't referring to the -5 part, actually, I glossed over that. I was referring to the fact that you don't need to be able to calculate SD, you just have to know how to use it, and to understand what role range of 0 would have in a SD problem. It definately can come up on the real exam.
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 18 May 2005, 06:08
HIMALAYA wrote:
ian7777 wrote:
thearch wrote:
Dan wrote:
thearch,

maybe I am missing something but,

if range = 0, it does not mean that SD is necessarily 0.

5 values could be:

5,1,1,1,5 range = 0, but SD is not.
5,5,5,5,5 range = 0, SD = 0.


you're almost right.
In the first case, range is not 0, it is 4. (Max value is 5 and min value is 1)
In this case, range can be 0 only with [b]-5 in the set, since 5 is the max value[/b], or with all 5, as you say in your second example. But sales can't be negative, and the first option (with -5 in the set) is not possible.


I definately agree not only with the answer, but also the approach. nice explanation.


but i disagree with thearch's explanation that the range is zero if -5 is in the set. the only possible case to have zero is identical numbers.


Oh yes, :oops: :oops:
you're absolutely right, I think it is better to edit the post and delete such bulls**t
VP
VP
User avatar
Joined: 13 Jun 2004
Posts: 1128
Location: London, UK
Schools: Tuck'08
Followers: 6

Kudos [?]: 24 [0], given: 0

 [#permalink] New post 18 May 2005, 06:42
A for me

with statement 1 we already ahve the number 5 and we know that the highest value - the lowest is 0. So all number are equals. So deviation =0

with statement 2 we have the information that the mean is 5 but we only know one value for one month (5) so it can be 20,10,5,10,20 or 5,5,5,5,5 for example. Impossible to be sure of the deviation.
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 18 May 2005, 07:06
Antmavel wrote:
A for me

with statement 1 we already ahve the number 5 and we know that the highest value - the lowest is 0. So all number are equals. So deviation =0

with statement 2 we have the information that the mean is 5 but we only know one value for one month (5) so it can be 20,10,5,10,20 or 5,5,5,5,5 for example. Impossible to be sure of the deviation.


Hi antmavel,
probably you overlooked that the stem states that "During certain 5 months, the highest month sales value is 5"
VP
VP
User avatar
Joined: 13 Jun 2004
Posts: 1128
Location: London, UK
Schools: Tuck'08
Followers: 6

Kudos [?]: 24 [0], given: 0

 [#permalink] New post 18 May 2005, 23:16
thearch wrote:
Antmavel wrote:
A for me

with statement 1 we already ahve the number 5 and we know that the highest value - the lowest is 0. So all number are equals. So deviation =0

with statement 2 we have the information that the mean is 5 but we only know one value for one month (5) so it can be 20,10,5,10,20 or 5,5,5,5,5 for example. Impossible to be sure of the deviation.


Hi antmavel,
probably you overlooked that the stem states that "During certain 5 months, the highest month sales value is 5"


:oops: yep
indeed D
Intern
Intern
avatar
Joined: 09 Dec 2009
Posts: 34
Followers: 0

Kudos [?]: 5 [0], given: 7

Re: Deviation [#permalink] New post 19 Jun 2010, 23:22
Please read this thread. Some good tips statistics-rules-and-tips-69015.html
Manager
Manager
avatar
Joined: 02 Nov 2009
Posts: 141
Followers: 2

Kudos [?]: 33 [0], given: 97

Re: Deviation [#permalink] New post 10 Jul 2011, 10:44
This answer has goto be D

1) The maimum value is 5
2) the remaining values su = 20 since there are 5 values
3) the only way that the remainng values can be = 20 is 5+5+5+5 since
the max value is 5
4) if any one value is less than 5 then the remaining values one of them is greater than 5 example
4 6 5 5 5 -- 6 is not possible

so therefore answer is D

A is also Suff since if in a range al the values are equal only then the SD is 0
Re: Deviation   [#permalink] 10 Jul 2011, 10:44
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic 770 in 5 Months-My Approach BethEconomistGMAT 0 01 Jul 2014, 14:33
5 IELTS 7.5, 1.5 months preparation sahilchaudhary 15 10 Dec 2013, 22:41
Q. The amount of electricity a month is 5,000 kilowatt. pretttyune 2 10 Nov 2007, 20:27
Would a 4-5 month old rec be ok? aceman626 2 29 Aug 2007, 07:45
GMAT Prep Plan - Retake in 4 to 5 months jsnooky33 3 29 Aug 2006, 08:53
Display posts from previous: Sort by

During certain 5 months, the highest month sales value is 5.

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

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®.