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Pure Mathematics
 Online Tutoring : Forum : Homework Help - Mathematics : Pure Mathematics
Topic Topic: probability (independent events) Post ReplyNew Question
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Online_tutoring
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Joined: 12 December 2006
Posts: 32
Posted: 22 September 2007 at 1:06am | IP Logged Quote Online_tutoring

The probability that it will be rainy on Monday is 7/10. The probability that it will be windy on Monday is 6/10. These events are independent. What is the probability that it will be rainy or windy on Monday?: *
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Alexmaths
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Joined: 29 September 2007
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Posted: 29 September 2007 at 1:08am | IP Logged Quote Alexmaths

p(A) = 7/10 p(B) = 6/10 and since it is independent p(AnB) =7/10 *6/10 = 42/100

now,
p(AuB) = p(A) + p(B) - p(AnB)
          =  7/10 + 6/10 - 42/100
          = 22/25


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