Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!
Dec 1511:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease.- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options. - Dec 21
11:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
20 Jan 2016, 12:46
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
50% (00:16) correct
50%
(00:02)
wrong
based on 9
sessions
History
Date
Time
Result
Not Attempted Yet
Each year three space shuttles are launched, two in June and one in October. If each shuttle is
known to occur without a delay in 90% of the cases and if the current month is January, what is the
probability that at least one of the launches in the next 16 months will be delayed?
Not aware of the answers
known to occur without a delay in 90% of the cases and if the current month is January, what is the
probability that at least one of the launches in the next 16 months will be delayed?
Not aware of the answers
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
20 Jan 2016, 13:58
Kudos
Bookmarks
If the current month is January, then in the next 16 months there will be 3 launches - 2 in June and 1 in October. 16 months brings us to April of the following year.
To find the probability of at least one launch being delayed during that time, we should look for the opposite case - the probability of no launches being delayed in the next 16 months - and subtract that from 1.
Probability that any given launch is not delayed = 0.9
Probability that 3 launches are not delayed = 0.9*0.9*0.9 = 0.729
Probability that at least one launch will be delayed = 1-0.729 = 0.271 = 27.1%
Cheers
To find the probability of at least one launch being delayed during that time, we should look for the opposite case - the probability of no launches being delayed in the next 16 months - and subtract that from 1.
Probability that any given launch is not delayed = 0.9
Probability that 3 launches are not delayed = 0.9*0.9*0.9 = 0.729
Probability that at least one launch will be delayed = 1-0.729 = 0.271 = 27.1%
Cheers
23 Jan 2016, 12:45
Kudos
Bookmarks
Hi Nak07,
What is the source of this question? I ask because it's not written in proper 'gmat' style, it's poorly-worded, doesn't include the 5 answer choices and a number of the 'details' in this question (about the months that the shuttles are launched and the 16 month timeframe) have absolutely NO impact on the calculation (the prompt could have simply stated "what is the probability that at least one of the launches this year will be delayed?"). If you're studying with materials that aren't 'in line' with the prompts that you'll see on Test Day, then you're likely not preparing in the most effective way possible to face the GMAT.
GMAT assassins aren't born, they're made,
Rich
What is the source of this question? I ask because it's not written in proper 'gmat' style, it's poorly-worded, doesn't include the 5 answer choices and a number of the 'details' in this question (about the months that the shuttles are launched and the 16 month timeframe) have absolutely NO impact on the calculation (the prompt could have simply stated "what is the probability that at least one of the launches this year will be delayed?"). If you're studying with materials that aren't 'in line' with the prompts that you'll see on Test Day, then you're likely not preparing in the most effective way possible to face the GMAT.
GMAT assassins aren't born, they're made,
Rich
--== Message from the GMAT Club Team ==--
THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. 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.
THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. 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.
