A low-pressure weather system is approaching Plainville; : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 23 Jan 2017, 06:00

### 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

Manager
Joined: 14 Jun 2005
Posts: 100
Followers: 1

Kudos [?]: 10 [0], given: 0

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

### Show Tags

07 Mar 2006, 09:27
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 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
If you have any questions
New!
Director
Joined: 24 Oct 2005
Posts: 575
Location: NYC
Followers: 1

Kudos [?]: 59 [0], given: 0

### Show Tags

07 Mar 2006, 11:58
IMO C..
_________________

Success is my only option, failure is not -- Eminem

Director
Joined: 27 Feb 2006
Posts: 632
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

07 Mar 2006, 14:28
I pick ^ B ^
VP
Joined: 22 Aug 2005
Posts: 1120
Location: CA
Followers: 1

Kudos [?]: 102 [0], given: 0

### Show Tags

07 Mar 2006, 15:26
B.

if:
percentage of spring rainfalls in Plainville that are thundershowers = 90 %

p(thundershowers) = 0.70 * 0.90

if:
percentage of spring rainfalls in Plainville that are thundershowers = 30%
p(thundershowers) = 0.70 * 0.30
_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

Senior Manager
Joined: 22 Nov 2005
Posts: 476
Followers: 2

Kudos [?]: 20 [0], given: 0

### Show Tags

07 Mar 2006, 17:56
I'll also go for B

Nice explanation

duttsit wrote:
B.

if:
percentage of spring rainfalls in Plainville that are thundershowers = 90 %

p(thundershowers) = 0.70 * 0.90

if:
percentage of spring rainfalls in Plainville that are thundershowers = 30%
p(thundershowers) = 0.70 * 0.30
VP
Joined: 07 Nov 2005
Posts: 1131
Location: India
Followers: 5

Kudos [?]: 41 [0], given: 1

### Show Tags

07 Mar 2006, 19:52
Another B.
Manager
Joined: 14 Jun 2005
Posts: 100
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

08 Mar 2006, 09:53
OA: B
Intern
Joined: 19 Dec 2004
Posts: 19
Followers: 0

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

### Show Tags

08 Mar 2006, 15:52
I would choose B.
Manager
Joined: 14 Jun 2005
Posts: 100
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

09 Mar 2006, 11:45
duttsit wrote:
B.

if:
percentage of spring rainfalls in Plainville that are thundershowers = 90 %

p(thundershowers) = 0.70 * 0.90

if:
percentage of spring rainfalls in Plainville that are thundershowers = 30%
p(thundershowers) = 0.70 * 0.30

But can't I use the same arguement for C?

" thundershowers, which sometimes result from low-pressure systems"

What if the % of thundershowers from low pressure is .1 or .9?
Manager
Joined: 06 Aug 2005
Posts: 91
Location: Minneapolis
Followers: 1

Kudos [?]: 2 [0], given: 0

### Show Tags

09 Mar 2006, 22:40
hellom3p wrote:
duttsit wrote:
B.

if:
percentage of spring rainfalls in Plainville that are thundershowers = 90 %

p(thundershowers) = 0.70 * 0.90

if:
percentage of spring rainfalls in Plainville that are thundershowers = 30%
p(thundershowers) = 0.70 * 0.30

But can't I use the same arguement for C?

" thundershowers, which sometimes result from low-pressure systems"

What if the % of thundershowers from low pressure is .1 or .9?

Exactly my thoughts.
If percentage of thunderstorms from low pressure in Plainville is 70, then the probability of thunderstorm will be .7
B has 2 links to get the probability
C has direct link for the probability.
Still not sure if B is the correct choice.
VP
Joined: 22 Aug 2005
Posts: 1120
Location: CA
Followers: 1

Kudos [?]: 102 [0], given: 0

### Show Tags

10 Mar 2006, 17:13
hellom3p wrote:
duttsit wrote:
B.

if:
percentage of spring rainfalls in Plainville that are thundershowers = 90 %

p(thundershowers) = 0.70 * 0.90

if:
percentage of spring rainfalls in Plainville that are thundershowers = 30%
p(thundershowers) = 0.70 * 0.30

But can't I use the same arguement for C?

" thundershowers, which sometimes result from low-pressure systems"

What if the % of thundershowers from low pressure is .1 or .9?

the percentage of thundershowers in Plainville that result from low-pressure systems.

C would have been correct ans IMO if it read:
the percentage of low-pressure systems that result into thundershowers in Plainville.

_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

Senior Manager
Joined: 17 Aug 2005
Posts: 392
Location: Boston, MA
Followers: 2

Kudos [?]: 93 [0], given: 0

### Show Tags

11 Mar 2006, 09:27
B. I was torn b/w B and C. The reason I thought C was wrong was b/c the question asks, "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?" --- Meaning what's the probability there will be a thunderstorm in SPRING (soon). The answer choice that best helps us answer that question is the one which tells us the pct of spring rainfalls that lead to thunderstorms. We already know the pct of low pressure systems that lead to rainfall(70%).

Even though B is two steps away from the initial event (low pressure systems), it gives the best information. C could tell us the percentage of thunderstorms that occur from low pressure systems all year long, which is not as relevant as B. Just my 2 cents.
11 Mar 2006, 09:27
Similar topics Replies Last post
Similar
Topics:
17 Mayor of Plainville: In order to help the economy of Plainsville 6 21 Nov 2014, 06:39
6 A low-pressure weather system is approaching Plainville; 12 25 Jan 2010, 09:18
After observing the Earth s weather patterns and the 11-year 5 06 Oct 2007, 13:51
Weather patterns in various parts of the country appear to 11 26 Jun 2007, 05:06
1 CR - weather forecast 7 18 Mar 2007, 20:22
Display posts from previous: Sort by