作者Pitter ()
看板Statistics
標題[問題] 邊際機率分配的範圍
時間Thu Feb 12 16:39:09 2009
Each customer who enters clothing store will purchase a suit with
probability p. Given that the number of customers entering the store
is Poisson distributed with mean λ.
(1) Prove that the number of suits that store sells has a Poisson distribution
with mean λp.
所以 X 之邊際機率分配為 f(x) = Σ f(x,n)
n
= Σ.....
n=x
後面小弟就不再多寫了，既然是求 x 的邊際機率，那放 n 的範圍不是應該為
0 到無限大嗎？怎麼是 x 到無限大呢？
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1F：→ west1996:n是進來的人 x是購買的人 所以n當然不能小於x 02/12 17:10
2F：→ Pitter:感謝... 02/12 17:20