It is currently 17 Oct 2017, 05:03

### 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

# A low-pressure weather system is approaching Plainville;

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 12 Mar 2009
Posts: 308

Kudos [?]: 451 [1], given: 1

A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

25 Jan 2010, 10:18
1
KUDOS
5
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

47% (01:25) correct 53% (01:28) wrong based on 230 sessions

### HideShow timer Statistics

A low-pressure weather system is approaching Plainville; rainfall results from about 70 percent of such systems in the Plainville area. Moreover, the current season, spring, is the time of year in which thundershowers, which sometimes result from low-pressure systems, are most likely to occur in Plainville.
Knowing which one of the following, in addition to the information above, would be most useful for determining the probability that Plainville will have a thundershower soon?
(A) the percentage of thundershowers in Plainville that occur in the spring
(B) the percentage of spring rainfalls in Plainville that are thundershowers
(C) the percentage of thundershowers in Plainville that result from low-pressure systems
(D) whether low-pressure systems in other areas are associated with rainfall
(E) whether Plainville has more or fewer thundershowers each spring than do nearby towns

OA is
[Reveal] Spoiler:
b

Kudos [?]: 451 [1], given: 1

Manager
Joined: 28 Apr 2011
Posts: 177

Kudos [?]: 10 [2], given: 6

Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

05 Apr 2012, 03:51
2
KUDOS
IMO B......

A is not good as we are not sure that low pressure helps thundershower or not?

Kudos [?]: 10 [2], given: 6

Manager
Joined: 29 Jul 2009
Posts: 215

Kudos [?]: 95 [1], given: 6

Re: LSAT Test IV.....pl help [#permalink]

### Show Tags

25 Jan 2010, 14:50
1
KUDOS
The question asks what's the probability that a Plainville will have a thunder shower soon. You know that low-pressure weather system is approaching Plainville and rainfall results from about 70 percent of such systems in the Plainville area. You also know that it's spring time and thunderstorms are most likely to occur during spring. If you know the probability of thunderstorms during spring you and when a low front is moving towards it then the probability of thunder showers = .70*probability of thundershows during spring.

Kudos [?]: 95 [1], given: 6

Magoosh GMAT Instructor
Joined: 28 Nov 2011
Posts: 303

Kudos [?]: 1226 [1], given: 2

Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

05 Apr 2012, 17:07
1
KUDOS
Expert's post
From the argument we know the following:

1) 70% of low-pressure systems (LPS) result in rain.
2) Thunderstorms sometimes result from LPS.
3) Spring is the most common time for thunderstorms.

We need an answer that will best help us determine whether this LPS will result in a thunderstorm.

The information we don't have is what percent of time that it is raining is it a thunderstorm. This piece of information will help us determine how likely it is for a thunderstorm appear. After all, if it is LPS with rain, but when it rains there is only a 1% chance that it will thunderstorm, this is very different than if there is a 90% of a thunderstorm every time it rains. (B) provides this information.

(A) wouldn't help us, because even if most thunderstorms occurred in Spring that wouldn't tell us how likely this system will bring a thunderstorm. Indeed all of the other seasons could not have any thunderstorms. If spring only has one thunderstorm per year (making it the season with the most thunderstorms) this is not going to tell us much.
_________________

Christopher Lele
Magoosh Test Prep

Kudos [?]: 1226 [1], given: 2

Manager
Joined: 24 Dec 2009
Posts: 214

Kudos [?]: 49 [0], given: 3

Re: LSAT Test IV.....pl help [#permalink]

### Show Tags

25 Jan 2010, 17:07

1. thundershowers are approaching
2. 70% of rainfall is because of low-pressure system
3. In spring there are thundershowers.

Combine 1,2 & 3 and you will reach the conclusion.

Kudos [?]: 49 [0], given: 3

Verbal Forum Moderator
Joined: 31 Jan 2010
Posts: 487

Kudos [?]: 161 [0], given: 149

WE 1: 4 years Tech
Re: LSAT Test IV.....pl help [#permalink]

### Show Tags

13 Jan 2011, 07:37
Guys can someone explain why the answer is B and not C or A
_________________

My Post Invites Discussions not answers
Try to give back something to the Forum.I want your explanations, right now !

Kudos [?]: 161 [0], given: 149

Manager
Joined: 07 Jan 2010
Posts: 143

Kudos [?]: 95 [0], given: 57

Location: So. CA
WE 1: 2 IT
WE 2: 4 Software Analyst
Re: LSAT Test IV.....pl help [#permalink]

### Show Tags

13 Jan 2011, 23:43
mundasingh123 wrote:
Guys can someone explain why the answer is B and not C or A

i can tell you why its not A, choice A is already repeated from the passage, so repeating what the passage already stated wouldn't be the most useful in this case...?

Kudos [?]: 95 [0], given: 57

Verbal Forum Moderator
Joined: 31 Jan 2010
Posts: 487

Kudos [?]: 161 [0], given: 149

WE 1: 4 years Tech
Re: LSAT Test IV.....pl help [#permalink]

### Show Tags

13 Jan 2011, 23:49
gtr022001 wrote:
mundasingh123 wrote:
Guys can someone explain why the answer is B and not C or A
The stimulus just says "most likely to occur".It doesnt say anything about the percentage

i can tell you why its not A, choice A is already repeated from the passage, so repeating what the passage already stated wouldn't be the most useful in this case...?

_________________

My Post Invites Discussions not answers
Try to give back something to the Forum.I want your explanations, right now !

Kudos [?]: 161 [0], given: 149

Manager
Joined: 21 Aug 2012
Posts: 189

Kudos [?]: 52 [0], given: 349

Concentration: General Management, Operations
Schools: HBS '19 (S)
GMAT 1: 740 Q49 V42
Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

05 Mar 2013, 07:13
Are we assuming that rainfall and thundershowers are the same ?

Kudos [?]: 52 [0], given: 349

Manager
Joined: 24 Sep 2012
Posts: 90

Kudos [?]: 166 [0], given: 3

Location: United States
GMAT 1: 730 Q50 V39
GPA: 3.2
WE: Education (Education)
Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

05 Mar 2013, 16:06
We are assuming thundershowers to be a type of rainfall.

roopika2990 wrote:
Are we assuming that rainfall and thundershowers are the same ?

Kudos [?]: 166 [0], given: 3

Intern
Joined: 31 Dec 2012
Posts: 10

Kudos [?]: [0], given: 55

GMAT 1: 700 Q44 V42
Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

05 Apr 2013, 05:56
roopika2990 wrote:
Are we assuming that rainfall and thundershowers are the same ?

This was my mistake as well. I thought that rainfalls are irrelevant, as thundershowers result from LPS.

Anyway, now I understand it.

Kudos [?]: [0], given: 55

Senior Manager
Joined: 16 Dec 2011
Posts: 426

Kudos [?]: 232 [0], given: 70

Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

06 Apr 2013, 07:05
A low-pressure weather system is approaching Plainville; rainfall results from about 70 percent of such systems in the Plainville area. Moreover, the current season, spring, is the time of year in which thundershowers, which sometimes result from low-pressure systems, are most likely to occur in Plainville.

Premises:
1) LPS is approaching
2) 70% of LPS results in rainfall
3) Thundershowers sometimes result from LPS
4) Thundershowers are most likely to occur in spring
5) This is spring season

To determine the probability of having a thundershower soon, we need to know either percentage of LPS results in thundershowers or percentage of spring rainfalls that are thundershowers (we already know that 70% of LPS results in rainfall).

This makes option B correct.

Kudos [?]: 232 [0], given: 70

GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10130

Kudos [?]: 261 [0], given: 0

Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

13 Jan 2015, 22:16
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

Kudos [?]: 261 [0], given: 0

GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10130

Kudos [?]: 261 [0], given: 0

Re: A low-pressure weather system is approaching Plainville; [#permalink]

### Show Tags

24 Apr 2017, 00:31
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

Kudos [?]: 261 [0], given: 0

Re: A low-pressure weather system is approaching Plainville;   [#permalink] 24 Apr 2017, 00:31
Display posts from previous: Sort by

# A low-pressure weather system is approaching Plainville;

 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®.