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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 09 Oct 2006, 11:44
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 09 Oct 2006, 13:05
Probablity of rain is 30/100=0.3
Probability of no rain 70/100=0.7

Probablity of rain on 3 days is 6c3(0.3)^3(0.7)^3

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  [#permalink] 09 Oct 2006, 13:05
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