GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Aug 2018, 21:12

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.

Close

Request Expert Reply

Confirm Cancel

Probability and Time Distance Question

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 29 Jun 2008
Posts: 15
Probability and Time Distance Question  [#permalink]

Show Tags

New post 19 Jul 2009, 19:39
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

Hi Everyone,

Please find attached the document having questions for probability and time distance.

Thanks in advance.

Regards,
Aban

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

Attachments

Time_Distance_Probability_Question.doc [106.5 KiB]
Downloaded 943 times

To download please login or register as a user

Senior Manager
Senior Manager
avatar
Joined: 23 Jun 2009
Posts: 353
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 01:52
For q1;

The total time is = time traveled 60 mph + time traveled 30 mph.
(x-5)/60 hours + 5/30 hours = (x+5)/60 hours.
if he had traveled at a constant 60 mph speed. His travel time would have been x/60 hours.
Thus we get the percentage =>
Time difference = (x+5)/60-x/60= 5/60 hours = 1/12 hours.
Time for constant travel = x/60 hours.
So the percentage difference is (1/12).100 / (x/60)= 5.100/x = 500/x %
Senior Manager
Senior Manager
avatar
Joined: 23 Jun 2009
Posts: 353
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 01:56
For question 2;
There are 4 cases;
1- St.A plays good
2- St.A plays bad but st.B plays good
3- St.A and St.B plays bad but st.C plays good.
4-All plays bad.
Prob of 1st case is 0,3
Prob of 2nd case is 0,7.0,3
Prob of 3rd case is 0,7.0,7.0,3
Prob of 4th case is 0,7.0,7.0,7
Sum of all is 0,3 + 0,21 + 0,147 + 0,343 = 1
In only the last case the song is bad. So the prob. that a good song is played is 1-0,343=0,657
D
Manager
Manager
User avatar
Joined: 27 Jun 2008
Posts: 140
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 03:24
For everyone's benefit
Q1
Image
Manager
Manager
User avatar
Joined: 27 Jun 2008
Posts: 140
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 03:26
Q2
Image
Manager
Manager
User avatar
Joined: 27 Jun 2008
Posts: 140
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 03:31
Q2)
Prob of Leo to hear a song he likes =
Prob of Radio A playing songs which Leo likes
+Prob of Radio B playing songs which Leo likes
+Prob of Radio C playing songs which Leo likes
= 0.3 + 0.3 * 0.7 +0.3 *0.3 *0.7
= 0.3+0.21+0.147
=0.657
Option D
Manager
Manager
User avatar
Joined: 27 Jun 2008
Posts: 140
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 03:39
Time spent with 5 mile@30mph = X-5/60 + 5/30 = (X+5)/60
Time spent with entire trip @60mph = X/60.
Time Diff = 1/12
Q: % of diff with total time @60mph:
(1/12) / (X/60)*100
= (500/X)%
Intern
Intern
avatar
Joined: 29 Jun 2008
Posts: 15
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 20 Jul 2009, 19:17
Hi Guys,

Time distance was so simple... i just screwed it ... dont know y ... thanks for that one .. but for the probability one can anyone please elaborate the below mentioned logic for me as i dont know much about the proability:

1. Radio A --> 0.3 (I understand)
2. Radio B --> 0.3 (For radio B) * 0.7 (for the case where radio A is not played)
3. Radio C --> 0.3 (For radio C) * 0.3 (Why this 0.3 and not 1 - 0.3 = 0.7) * 0.7.

I dont understand the logi behind two times 0.3 in the last case as mentioned by irajeevsingh.

i know it might b simple... not clicking to me :( :( ....

Thanks for your help.

Regards,
Aban
Senior Manager
Senior Manager
avatar
Joined: 23 Jun 2009
Posts: 353
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Re: Probability and Time Distance Question  [#permalink]

Show Tags

New post 21 Jul 2009, 00:11
Look at this file. This problem is a decision tree problem.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

Attachments

dectree.JPG
dectree.JPG [ 13.3 KiB | Viewed 1199 times ]

Re: Probability and Time Distance Question &nbs [#permalink] 21 Jul 2009, 00:11
Display posts from previous: Sort by

Probability and Time Distance Question

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.