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# S1 Probability Notation

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Why bother with a post grad course - waste of time? 17-10-2016
1. SeanFM Zacken

How do you interpret these from this venn diagram?

http://www.thestudentroom.co.uk/atta...5&d=1465764079
2. (Original post by govandpolitics)
SeanFM Zacken

How do you interpret these from this venn diagram?

http://www.thestudentroom.co.uk/atta...5&d=1465764079
P(only A occurring) = 0.4

P(A and B occurring) = 0.3

P(only B occurring) = 0.2

P(neither A nor B nor both A and B (basically absolutely nothing happening)) = 0.1
3. (Original post by govandpolitics)
SeanFM Zacken
Whoops, sorry, just noticed the link.

P(A' and B') is the probability that neither A nor B happen, so that's the bit outside the venn diagram.

P(A' and B) is the probability that A doesn't happen, but B does happen. So that's the same as saying only B happens. You can take it from there.

P(A or B') is the probability that A happens (that could include A and B happening as well) or B doesn't happen. So you add these two together.
4. (Original post by Zacken)
Whoops, sorry, just noticed the link.

P(A' and B' is the probability that neither A nor B happen, so that's the bit outside the venn diagram.

P(A' and B) is the probability that A doesn't happen, but B does happen. So that's the same as saying only B happens. You can take it from there.

P(A or B' is the probability that A happens (that could include A and B happening as well) or B doesn't happen. So you add these two together.
thanks
5. (Original post by Zacken)
Whoops, sorry, just noticed the link.

P(A' and B' is the probability that neither A nor B happen, so that's the bit outside the venn diagram.

P(A' and B) is the probability that A doesn't happen, but B does happen. So that's the same as saying only B happens. You can take it from there.

P(A or B' is the probability that A happens (that could include A and B happening as well) or B doesn't happen. So you add these two together.
Hey, if you're free you think you can maybe help me with some AQA c4 questions? The AQA c4 thread is pretty inactive
6. (Original post by fpmaniac)
Hey, if you're free you think you can maybe help me with some AQA c4 questions? The AQA c4 thread is pretty inactive
Post a question in the maths forum, make a thread.

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