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What is the probability that it will rain tomorrow?

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by Jay@ManhattanReview » Mon Aug 20, 2018 2:03 am

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Your Answer

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E

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BTGmoderatorDC 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%.

OA E

Source: Veritas Prep
Certainly, each statement alone is not sufficient.

We have to get the probability that it will rain tomorrow.

By the information: If it rains today, the probability that it will rain tomorrow will increase by 10%, we get that if it rains today, the probability that it will rain tomorrow will be 40% + 10% of 40% = 44%. However, we do not know if it does NOT rain today, what will be the impact on tomorrow's rain . Whether the chance of tomorrow's rain, in relation to the non-occuarnce of todays' rain, decreases or increases; and by what percent.

The correct answer: E

Hope this helps!

-Jay
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