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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 08 Jan 2007, 23:14
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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Re: Probability [#permalink] New post 08 Jan 2007, 23:29
93.santosh wrote:
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 ?


I assume the begaining and ending days are included. if so,

= 6C3 (0.3)^3 (1-0.3)^(6-3)
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 [#permalink] New post 11 Jan 2007, 11:51
Agreed

.3*.3*.3*.7*.7*.7 = .009261

* 6c3 (20)

= 18.5%
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 [#permalink] New post 11 Jan 2007, 13:59
Yep. Typical binomial distribution:

prob = 6C3 * 0.3^3 * 0.7^(6-3)

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  [#permalink] 11 Jan 2007, 13:59
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