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

It is currently 15 Sep 2014, 01:34

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

Roy is making plans for the evening. He can watch a movie,

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
CEO
CEO
avatar
Joined: 15 Aug 2003
Posts: 3470
Followers: 60

Kudos [?]: 668 [0], given: 781

Roy is making plans for the evening. He can watch a movie, [#permalink] New post 30 Sep 2003, 12:48
Roy is making plans for the evening. He can watch a movie, go to a bar, or study for the MATH250 test. He is twice as likely to watch a movie than to go to a bar, and equally likely to watch a movie as he is to study for the test. What is the probability that Roy will study for the test?
Intern
Intern
avatar
Joined: 29 Aug 2003
Posts: 49
Location: Detroit, MI
Followers: 0

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

Re: Probability # 2 [#permalink] New post 01 Oct 2003, 06:08
Prob. that Roy watches a movie = P(M)
Prob. that Roy goes to a bar = P(B)
Prob. that Roy studies for the test = P(S)

P(M) + P(B) + P(S) = 1 ........ (1)

Given, P(M) = 2 * P(B)
P(M) = P(S)

So, (1) can be rewritten as P(S) + (P(S) / 2) + P(S) = 1
i.e. P(S) * 5/2 = 1 => P(S) = 2/5
Intern
Intern
avatar
Joined: 17 Sep 2003
Posts: 31
Location: Mumbai,India
Followers: 0

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

Re: Probability # 2 [#permalink] New post 04 Oct 2003, 04:22
amarsesh wrote:
Prob. that Roy watches a movie = P(M)
Prob. that Roy goes to a bar = P(B)
Prob. that Roy studies for the test = P(S)

P(M) + P(B) + P(S) = 1 ........ (1)

Given, P(M) = 2 * P(B)
P(M) = P(S)

So, (1) can be rewritten as P(S) + (P(S) / 2) + P(S) = 1
i.e. P(S) * 5/2 = 1 => P(S) = 2/5


Is there any other approach to such problems? just in case. i also got 2/5
_________________

Jazzy bee

SVP
SVP
User avatar
Joined: 03 Feb 2003
Posts: 1613
Followers: 6

Kudos [?]: 46 [0], given: 0

 [#permalink] New post 04 Oct 2003, 07:09
My approach is employing a basic formula P=F/T.
Let: P(bar) = p
Then: P(movie) = 2p; P(test) = 2p

The total set of variants = 5p
The favorable set = 2p

P=2p/5p=2/5
  [#permalink] 04 Oct 2003, 07:09
    Similar topics Author Replies Last post
Similar
Topics:
where we can watch movie online hamm0 0 03 Oct 2012, 03:46
4 Experts publish their posts in the topic There are 2 movies. 79% watch movie X and 89% watch movie Y. amitdgr 15 08 Nov 2008, 00:36
HELP-ROI/Break Even Calculator jamesrwrightiii 10 25 Mar 2008, 08:58
Carly has 3 movies that she can watch during the weekend: 1 uvs_mba 3 28 Oct 2006, 08:24
Bill is planning to watch some of his 5 favorite movies this GMATT73 2 30 Sep 2005, 18:37
Display posts from previous: Sort by

Roy is making plans for the evening. He can watch a movie,

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.