作者junjohn (why so serious)
看板Statistics
标题[问题]三个统计问题请高手指点
时间Sun Apr 10 17:28:35 2011
1.Let Y=N-X where X has a binomial distribution with parameters N and p.
Evaluate the product moment E[XY] and the covariance Cov[XY].
2.Determine the upper tail probabilities Pr{V>t} and mean E[V] for
a random variable V having the exponential density
fv(ν)={0,λe(-λν)
forν<0, forν>=0
3.Suppose that X has a binomial distribution with parameters p=1/2 and N,
where N is also random and follows a binomial distribution with
parameters q=1/4 and M=20. what is the mean of X.
各位统计高手，小弟统计功力不强，和同学讨论随机过程题目中，有这三题问题不解
如果有高手能够指点迷津将感激不尽!!!
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1F：→ bmka:这里不是作业解答版,请告诉大家你解题卡在哪里 04/10 23:21