作者hqq1232000 (出发)
看板Grad-ProbAsk
标题[商管] [统计]-possion分配
时间Sun Sep 5 23:37:20 2010
X为随机选取某一特定类型的锅炉表面具有缺陷的数目.
假设X具有poission分配,且平均数为G(未知),
过去的经验指出G的先天机率是p{G=4}=0.3, P{G=5}=0.5, P{G=6}=0.2.
(a) Given that the true mean of X is 5, what is the probability that a
randomly selected boiler has at most two flaws?
(b) Under that prior probabilities, what is the probability that a randomly
selected boiler has exactly two flaws?
(c) Suppose that a boiler was randomly selected and found that it had exactly
two flaws, Using this information, revise the prior probabilities of G
想请问第一题是这样吗? p(X<=2 已知G=5)
第二题是 0 吗
第三题
我想了很久，不知从何下手
希望能告诉我这题的观念~谢谢
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