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A low-pressure weather system is approaching Plainville; rainfall resu

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

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New post Updated on: 29 Aug 2019, 04:21
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Question Stats:

35% (01:58) correct 65% (01:54) wrong based on 313 sessions

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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

Originally posted by vaivish1723 on 25 Jan 2010, 10:18.
Last edited by Bunuel on 29 Aug 2019, 04:21, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 25 Jan 2010, 14:50
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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.
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 25 Jan 2010, 17:07
Answer is B.

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

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New post 13 Jan 2011, 07:37
Guys can someone explain why the answer is B and not C or A
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 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...?
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 05 Apr 2012, 03:51
IMO B......

A is not good as we are not sure that low pressure helps thundershower or not?
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 05 Apr 2012, 17:07
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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.
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 05 Mar 2013, 07:13
Are we assuming that rainfall and thundershowers are the same ?
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 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 ?
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 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.
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 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.
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 24 Jul 2019, 08:52
I marked the answer as C reason being "If I know the percentage of thunderstorms that result from low pressure weather system, that helps with finding the probability." Because the argument mentions thunderstorms sometimes results from low pressure systems and not always
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 25 Jul 2019, 04:19
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.
---->So, a low-pressure weather results in rainfall and thundershowers. In order to evaluate the possibility of thundershower, we just need to know the percentage of thundershower results from a low-pressure weather system.
-->My answer is C
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 29 Aug 2019, 04:04
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Bunuel - plz add OA to this question
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Re: A low-pressure weather system is approaching Plainville; rainfall resu  [#permalink]

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New post 29 Aug 2019, 04:21
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Re: A low-pressure weather system is approaching Plainville; rainfall resu   [#permalink] 29 Aug 2019, 04:21
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