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

It is currently 12 Jul 2014, 16:18

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

In a certain animal population for each of the first 3

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 20 Jul 2008
Posts: 7
Followers: 0

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

In a certain animal population for each of the first 3 [#permalink] New post 20 Aug 2008, 00:52
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (02:12) correct 0% (00:00) wrong based on 1 sessions
In a certain animal population for each of the first 3 months of life, the probability that an animal will die during that month is 1/10. For a group of 200 newborn members of the population, aprroximately how many would be expected to survive the first 3 month of life?
a)140
b)146
c)152
d)162
e)170

How would you solve this? Thanks
Intern
Intern
avatar
Joined: 13 Aug 2008
Posts: 17
Followers: 0

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

Re: PS Probabilty Question: in a certain animal population [#permalink] New post 20 Aug 2008, 01:50
My take,
P(animal dying during first 3 months) = P(dying in M1) + P(dying in M2) + P(dying in M3)
= (1/10) + (9/10)*(1/10) + (9/10)*(9/10)*(1/10)
= 271/1000

P(animal surviving the first 3 months) = 729/1000

No Of animals surviving (approx) = (729/1000) * 200 = 146

What is the OA?
Director
Director
avatar
Joined: 14 Aug 2007
Posts: 735
Followers: 7

Kudos [?]: 96 [0], given: 0

GMAT Tests User
Re: PS Probabilty Question: in a certain animal population [#permalink] New post 20 Aug 2008, 03:52
Ginc wrote:
In a certain animal population for each of the first 3 months of life, the probability that an animal will die during that month is 1/10. For a group of 200 newborn members of the population, aprroximately how many would be expected to survive the first 3 month of life?
a)140
b)146
c)152
d)162
e)170

How would you solve this? Thanks


Number of newborns that can die in first month = 1/10 * 200 = 20

Survived = 180

Number of newborns that can die in second month = 1/10 * 180 = 18

Survived = 162

Number of newborns that can die in third month = 1/10 * 162 = 16

Survived = 146
Intern
Intern
avatar
Joined: 20 Jul 2008
Posts: 7
Followers: 0

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

Re: PS Probabilty Question: in a certain animal population [#permalink] New post 20 Aug 2008, 05:39
Having a look at the replies now, thanks OA is 146
Manager
Manager
avatar
Joined: 27 Mar 2008
Posts: 81
Followers: 1

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

Re: PS Probabilty Question: in a certain animal population [#permalink] New post 20 Aug 2008, 12:50
200 * .10 = 20 died

180 * .10= 18 died

162 * .10= 16.2 = 16 died

Total died = 54

200-54= 146 (B)
Re: PS Probabilty Question: in a certain animal population   [#permalink] 20 Aug 2008, 12:50
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Animal population Madelaine88 3 12 Mar 2011, 11:29
2 Experts publish their posts in the topic In a certain population, there are 3 times as many people ag nsp007 6 05 May 2010, 12:56
In a certain animal population, for each of the first 3 qhoc0010 5 21 Jan 2005, 07:36
In a certain animal population, for each of the first 3 dshishkov 2 06 Nov 2004, 13:24
Of the 60 animals on a certain farm, 2/3 are either pigs or mba4me 2 12 Sep 2004, 00:44
Display posts from previous: Sort by

In a certain animal population for each of the first 3

  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®.