[問題] 邊際機率分配的範圍
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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