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

 It is currently 03 Jul 2015, 04:21

### 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

# In a certain animal population, for each of the first 3

Author Message
TAGS:
Director
Joined: 29 Oct 2004
Posts: 865
Followers: 2

Kudos [?]: 68 [0], given: 0

In a certain animal population, for each of the first 3 [#permalink]  21 Jan 2005, 07:36
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 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, approximately how many would be expected to survive the first 3 months of life?
(A) 140
(B) 146
(C) 152
(D) 162
(E) 170

Last edited by qhoc0010 on 21 Jan 2005, 12:18, edited 1 time in total.
Director
Joined: 31 Aug 2004
Posts: 610
Followers: 3

Kudos [?]: 50 [0], given: 0

I guess there is a flaw in your proba...
Manager
Joined: 25 Oct 2004
Posts: 249
Followers: 1

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

I agree with twixt, how can the probability be 101. The total probability of any event is 1.
SVP
Joined: 03 Jan 2005
Posts: 2246
Followers: 13

Kudos [?]: 226 [0], given: 0

I've seen that question. The probability in the question is 10%.
Director
Joined: 19 Nov 2004
Posts: 563
Location: SF Bay Area, USA
Followers: 3

Kudos [?]: 75 [0], given: 0

Expected value = Prob of survival for 3 months * Number of samples
E(x) = (9/10)*(9/10)*(9/10)*200 = 146
Director
Joined: 29 Oct 2004
Posts: 865
Followers: 2

Kudos [?]: 68 [0], given: 0

Got it, thx
OA is (B)
Similar topics Replies Last post
Similar
Topics:
61 Of the 60 animals on a certain farm, 2/3 are either cows or 49 11 Oct 2009, 23:59
Of the 60 animals on a certain farm, 2/3 are either pigs or 6 24 May 2009, 08:05
Of the 60 animals on a certain farm, 2/3 are either pigs or 1 19 Nov 2006, 04:41
Of the 60 animals on a certain farm, 2/3 are either pigs or 7 04 May 2006, 21:31
3 Of the 60 animals on a certain farm, 2/3 are either pigs or 14 22 Jan 2006, 22:59
Display posts from previous: Sort by