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The probability that it will rain in NYC on any given day in

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The probability that it will rain in NYC on any given day in [#permalink] New post 04 Feb 2003, 15:15
The probability that it will rain in NYC on any given day in July is 30%. what is the probability that it will rain on exactly 3 days from July 5 to July 10 ?

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 [#permalink] New post 04 Feb 2003, 23:50
Yeah... Not that easy...

There are six days from 5th to 10th of July; 3 rainy and 3 nonrainy
We need take any three - C(3,6)=20
Each combination of rainy days defines nonrainy ones.

P(3 rainy days and 3 nonrainy) = 0.3*0.3*0.3*0.7*0.7*0.7*20=0.18522

Am I right?
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 [#permalink] New post 05 Feb 2003, 00:01
stolyar wrote:
Yeah... Not that easy...

There are six days from 5th to 10th of July; 3 rainy and 3 nonrainy
We need take any three - C(3,6)=20
Each combination of rainy days defines nonrainy ones.

P(3 rainy days and 3 nonrainy) = 0.3*0.3*0.3*0.7*0.7*0.7*20=0.18522

Am I right?


Yes. I don't know about the result but the multiplication is right.

Good job.
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 [#permalink] New post 03 Aug 2003, 15:29
Is this not a classic example of Binomial Distribution, thus

6C3*(.3)^3*(.7)^3 ???

Is this also not the same as flip a coin 6 times and getting 3 heads ?

Last edited by tzolkin on 04 Aug 2003, 12:08, edited 1 time in total.
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HI [#permalink] New post 03 Aug 2003, 15:36
Tzolkin,

As vP you have a respectual duty to help your "Eternal Intern" :wink:

Thanks for a setting a good example in kind manners.

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HI   [#permalink] 03 Aug 2003, 15:36
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