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OpenStudy (anonymous):
Another question... The probability it will rain today is 0.4 and the probability it will rain tomorrow is 0.3. The probability it will rain both days is 0.2. What is the probability it will rain today or tomorrow?
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OpenStudy (anonymous):
0.2 it says that in the question...
OpenStudy (anonymous):
Oh yeah wth
OpenStudy (anonymous):
Can I has "Best Response" :3?
OpenStudy (anonymous):
Hold up, I'm pretty sure that's not what the question is asking
OpenStudy (anonymous):
0.2 is the combined probability of of it raining today and tomorrow
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OpenStudy (welshfella):
draw a tree diagram
OpenStudy (anonymous):
P(rain today or tomorrow) = P(rain today) + P(rain tomorrow) - P(rain today & tomorrow)
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