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Probability

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cashem'up:
Read the question then record your one choice in the separate answer booklet.
The weather is dreadful here. It rains on three times as many days as there are rain-free days.
Luckily the daily weather forecast is fairly good. Whether the forecast is for rain or for no rain, it is
correct on nine occasions out of ten.
Which one of the following is the probability that the weather forecast will predict rain tomorrow?

The answer is 13/16

Can someone explain how

Nobody:
i'm a bit confused too, found something similar here. :)

http://www.physicsforums.com/showthread.php?t=268897

cashem'up:
yea i had looked up that... didnt make sense to me :( ... lets just see if someone realy awesome can do this...

Arthur Bon Zavi:

--- Quote from: cashem'up on May 05, 2011, 06:50:49 am ---Read the question then record your one choice in the separate answer booklet.
The weather is dreadful here. It rains on three times as many days as there are rain-free days.
Luckily the daily weather forecast is fairly good. Whether the forecast is for rain or for no rain, it is
correct on nine occasions out of ten.
Which one of the following is the probability that the weather forecast will predict rain tomorrow?

The answer is 13/16

Can someone explain how

--- End quote ---

What is that supposed to be meant ?

Can you provide with a snapshot of the paper or type in other options ?

Alpha:

--- Quote from: Fidato on May 05, 2011, 10:57:34 am ---What is that supposed to be meant ?

Can you provide with a snapshot of the paper or type in other options ?

--- End quote ---

P (rain) = 3/ 4  :-\

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9694%20-%20Thinking%20Skills/9694_s07_qp_3.pdf

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