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What is the probability that it will rain tomorrow ?

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What is the probability that it will rain tomorrow ? [#permalink]

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New post 23 Nov 2014, 13:14
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A
B
C
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E

Difficulty:

  35% (medium)

Question Stats:

57% (00:32) correct 43% (00:26) wrong based on 237 sessions

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What is the probability that it will rain tomorrow?

(1) The probability that it rains today is 40%.
(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.
[Reveal] Spoiler: OA

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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 24 Nov 2014, 04:35
1) The probability that it rains today is 40%.
it does not states any relation for tomorrow . INSUFFICIENT

2) If it rains today, the probability that it will rain tomorrow will increase by 10%
From this statement prob. of tomorrow's will increase but we don't have that prob. in hand and that is the question itself.INSUFFICIENT.

there is no definite result after combining both statements.

Answer E

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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 28 Nov 2014, 07:18
It is E .

But my doubt is why cant it be C? from 1 and 2 we can get that it is going to rain tomorrow and we have 44% probability also.
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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 28 Nov 2014, 19:22
(1) Insufficient. The chance of rain today is 40%. But no information what's the chance of rain tomorrow. It could be 0% chance or 70% chance.

(2) Insufficient. If it will rain today the chance of rain tomorrow increases by 10%. So if we know that a chance of rain tomorrow is 50% then if it rains today a chance of rain tomorrow will be 10% greater than 50%. However, we are not told anything about a chance of rain for tomorrow.

(1)+(2) Insufficient. Still no information about the chance of rain tomorrow.

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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 28 Nov 2014, 20:01
prashd wrote:
It is E .

But my doubt is why cant it be C? from 1 and 2 we can get that it is going to rain tomorrow and we have 44% probability also.


Our goal is to find the "What is the probability that it will rain tomorrow".

1) Prob. that it rains today =40/100=2/5
Prob. of not having rains today=1-2/5=3/5

2) If it rains today, the probability that it will rain tomorrow will increase by 10%
But the prob.that it rains today is tomorrow is still x.

If we combine both the statements ,This concludes to
prob. that rain today =2/5 and the prob. that it rains tomorrow =x+10%

Since the prob. that it will rain tomorrow is still unknown.

Answer E

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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 15 May 2016, 08:42
i am still not able to understand how it should be E. in my opinion it should be C.

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Re: What is the probability that it will rain tomorrow ? [#permalink]

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New post 15 May 2016, 09:46
aashu4uiit wrote:
What is the probability that it will rain tomorrow?

(1) The probability that it rains today is 40%.
(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.


Statement 1 - It only gives us the probability of raining today. However, we want to know the probability of rain tomorrow. Insufficient.
Statement 2- It says that if it rains today the probability of raining tomorrow will increase by 10%. But wait, we have no idea what is the probability of raining tomorrow.

Both statement combined together do not give the exact probability of raining tomorrow or probability of raining tomorrow if it rains today. Hence insufficient.

Answer is 'E'
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What is the probability that it will rain tomorrow ? [#permalink]

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New post 04 Aug 2016, 08:00
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aashu4uiit wrote:
What is the probability that it will rain tomorrow?

(1) The probability that it rains today is 40%.
(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.


(1) The probability that it rains today is 40%.
Probability of rain today = \(\frac{40}{100}= \frac{2}{5}\) ; No rain today \(= \frac{3}{5}\)
NO INFORMATION ABOUT TOMORROW
INSUFFICIENT

(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.
Probability of rain today = x ; Probability of rain tomorrow = x+10%
No information on today's chances of rain
INSUFFICIENT

MERGE BOTH
Probability that it rains today = \(\frac{2}{5}\)
If Rain today then Tomorrow's Rain probability = \(\frac{2}{5}+\)10% \(of \frac{2}{5}\)
If No rain today then Tomorrow's Rain probability = ??????? NO INFORMATION GIVEN
Can we calculate it NO WE CANNOT ; Today no rain = 3/5 thats all we know. How this corelates to tomorrow is not given anywhere in the question
INSUFFICIENT
ANSWER IS E
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Re: What is the probability that it will rain tomorrow ? [#permalink]

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Re: What is the probability that it will rain tomorrow ?   [#permalink] 22 Sep 2017, 23:59
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