It is currently 20 Oct 2017, 17:11

### 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

# During an experiment, some water was removed from each of 6

Author Message
Manager
Joined: 28 Jul 2004
Posts: 136

Kudos [?]: 73 [0], given: 2

Location: Melbourne
Schools: Yale SOM, Tuck, Ross, IESE, HEC, Johnson, Booth
During an experiment, some water was removed from each of 6 [#permalink]

### Show Tags

01 Jan 2009, 23:01
1
This post was
BOOKMARKED
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

During an experiment, some water was removed from each of 6 water tanks. If the standard deviation of the volumes of water in tanks at the beginning was 10 gallons, what was the std devation of the volumes of water at the end of experiment

1) For each tank, 30% percent of the water which was there at the beginning was removed at the end of experiment

2) the average (Arithmetic mean) volume of water at the end of experiment was 63 gallons

I have attached the problem as word doc. Does anyone know how can I embed the image in this page itself rather than as attachment?
Attachments

DS_Problem.doc [70.81 KiB]

_________________

kris

Kudos [?]: 73 [0], given: 2

SVP
Joined: 17 Jun 2008
Posts: 1534

Kudos [?]: 279 [0], given: 0

Re: Standard deviation of Remaining Water [#permalink]

### Show Tags

02 Jan 2009, 04:52

If a number is subtracted from each of the member numbers then the SD remains the same.

However, stmt2 does not give any info to get at SD.

Kudos [?]: 279 [0], given: 0

Manager
Joined: 28 Jul 2004
Posts: 136

Kudos [?]: 73 [0], given: 2

Location: Melbourne
Schools: Yale SOM, Tuck, Ross, IESE, HEC, Johnson, Booth
Re: Standard deviation of Remaining Water [#permalink]

### Show Tags

02 Jan 2009, 21:11
that is correct..thanks a lot Thakur!
_________________

kris

Kudos [?]: 73 [0], given: 2

Re: Standard deviation of Remaining Water   [#permalink] 02 Jan 2009, 21:11
Display posts from previous: Sort by