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# S2 Jan 2015 (IAL) Watch

1. Q1c can someone help me on this i thought for poisson distribution events were independent can someone clear up this issue i got?
2. I've moved this to the maths forum where hopefully you'll get more responses.

Just some advice, it might be useful if you included the question or had a link to the paper, so our users will be in a better position to help you.
3. (Original post by jonnypdot)
Q1c can someone help me on this i thought for poisson distribution events were independent can someone clear up this issue i got?
4. They are independent, but you are calculating a conditional probability here.

P(1 on first day, 3 on second day | (given) 4 in 2 days).
5. (Original post by Zacken)
They are independent, but you are calculating a conditional probability here.

P(1 on first day, 3 on second day | (given) 4 in 2 days).
so can u give me a word equation of what to calculate?
6. (Original post by jonnypdot)
so can u give me a word equation of what to calculate?
Probability X = 1 * Probability X=3 all divided by Probability X=4
7. (Original post by Zacken)
Probability X = 1 * Probability X=3 all divided by Probability X=4
so P(B|A) = P(AnB) / P(A)

P(AnB) = P(B) because event B has a total of 4 car and so does event A
8. (Original post by jonnypdot)
so P(B|A) = P(AnB) / P(A)

P(AnB) = P(B) because event B has a total of 4 car and so does event A
Where A is the event "4 cars" and B is the event "1 car on day 1 and 3 cars on day 2", then yes.
9. (Original post by Zacken)
Where A is the event "4 cars" and B is the event "1 car on day 1 and 3 cars on day 2", then yes.
ok thank you
10. (Original post by jonnypdot)
ok thank you
No problem.

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