作者Pitter ()
看板Statistics
标题[问题] 边际机率分配的范围
时间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 之边际机率分配为 f(x) = Σ f(x,n)
n
= Σ.....
n=x
後面小弟就不再多写了，既然是求 x 的边际机率，那放 n 的范围不是应该为
0 到无限大吗？怎麽是 x 到无限大呢？
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 118.167.199.179
1F：→ west1996:n是进来的人 x是购买的人 所以n当然不能小於x 02/12 17:10
2F：→ Pitter:感谢... 02/12 17:20