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The probability of sunshine on any given day in July for a town is 75%. The probability of rain is 25%.

 

 

What is the probability of sunshine 3 days in a row?

 

 

 

What is the probability of rain at least once during a week?

 Apr 15, 2019
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P(sunshine 3 days in a row)  = (.75)^3  ≈ 0.42 ≈  42%

 

P (rain at least once during the week)  = 

 

1 - P( of no rain during the week ) =

 

1 - (.75)^ 7  ≈ .87 ≈  87%

 

 

cool cool cool

 Apr 15, 2019

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