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# S2 problem question watch

1. https://gyazo.com/8eff49d405451fbb69b394cdb84ab407

Everything in this question is completely fine apart from part (e), in which I am stumped as to what to do?

Many thanks!
2. (Original post by iMacJack)
https://gyazo.com/8eff49d405451fbb69b394cdb84ab407

Everything in this question is completely fine apart from part (e), in which I am stumped as to what to do?

Many thanks!
I don't see what's confusing.

You want P(T < 4) * P(X=0) where X ~ Po(1.2).
3. (Original post by Zacken)
I don't see what's confusing.

You want P(T < 4) * P(X=0) where X ~ Po(1.2).
Ah - I see... thank you!
4. No problem.
5. (Original post by Zacken)
No problem.
Sometimes the phrasing of questions can include irrelevant information, obscuring what is actually a fairly simple question (here the test is that you know about the additive feature of the Possion distribution). Watch out for this in S2
Sometimes the phrasing of questions can include irrelevant information, obscuring what is actually a fairly simple question (here the test is that you know about the additive feature of the Possion distribution). Watch out for this in S2
Think you've quoted the wrong person.
7. (Original post by Zacken)
I don't see what's confusing.

You want P(T < 4) * P(X=0) where X ~ Po(1.2).
To rebump this (apologies) why is it not <= 4?
8. (Original post by iMacJack)
To rebump this (apologies) why is it not <= 4?
Eh? You should know that for a continuous random variable P(T < 4) = P(T <= 4).

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