Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 19 Jun 2013, 17:32
Customize  |  Hide

Search
Register
New posts
Unanswered

RAIN

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Manager
Manager
Joined: 20 May 2008
Posts: 57
Followers: 1

Kudos [?]: 3 [0], given: 1

RAIN [#permalink] New post 28 Jan 2009, 23:54
The probability that it will rain in NYC on any given day in July is 30%. what is the probability that it will rain on exactly 3 days from July 5 to July 10?


please give full explanation with reasons..
dint understand previous answers..
SVP
SVP
Joined: 17 Jun 2008
Posts: 1592
Followers: 7

Kudos [?]: 132 [0], given: 0

GMAT Tests User
Re: RAIN [#permalink] New post 29 Jan 2009, 03:13
Total number of days between the two days (inclusive) = 6.

Probability of choosing 3 days on which it rains = 3/6 = 1/2
Probability that it rains on exactly these three days = (1/2)*30% = 15%
CEO
CEO
User avatar
Joined: 29 Aug 2007
Posts: 2528
Followers: 41

Kudos [?]: 365 [0], given: 19

GMAT Tests User
Re: RAIN [#permalink] New post 29 Jan 2009, 09:11
LoyalWater wrote:
The probability that it will rain in NYC on any given day in July is 30%. what is the probability that it will rain on exactly 3 days from July 5 to July 10?


please give full explanation with reasons..
dint understand previous answers..


= 6C3 (0.3)^3 (1-0.3)^(6-3)
= 20 (0.3^3)(0.7^3)
= 18.52%
_________________

Verbal: new-to-the-verbal-forum-please-read-this-first-77546.html
Math: new-to-the-math-forum-please-read-this-first-77764.html
Gmat: everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1837
Location: New York
Followers: 20

Kudos [?]: 297 [0], given: 5

GMAT Tests User
Re: RAIN [#permalink] New post 29 Jan 2009, 09:23
agree with GMATTIGER approach.
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

Manager
Manager
Joined: 01 May 2008
Posts: 114
Location: São Paulo
Followers: 1

Kudos [?]: 4 [0], given: 0

Re: RAIN [#permalink] New post 08 Feb 2009, 16:43
GMATTIGER, can u explain why u multiplied 6C3?
Thanks a lot
Re: RAIN   [#permalink] 08 Feb 2009, 16:43
    Similar topics Author Replies Last post
Similar
Topics:
 New posts acid rain artabro 2 15 Dec 2004, 10:21
New posts Probabilty of rain cJackSparrow 6 13 Feb 2006, 08:03
New posts DS : Rain.. haas_mba07 5 06 Aug 2006, 20:13
New posts Acid rains pawan82 2 05 Jul 2007, 23:29
New posts ACID RAIN lordw 4 15 Jul 2008, 11:22
Display posts from previous: Sort by

RAIN

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: VeritasPrepKarishma, Bunuel

Search for:


cron

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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com