作者wolf035 (阿荣)
看板Statistics
标题[请益] 北科工管91考题
时间Thu May 4 13:24:27 2006
1. prove that if X~N(u,sigma^2) and let Z= x-u/sigma then Z have
mean = 0 and standard deviation = 1
2. If the random variable X has an exponential distribution with
parameter lamda. Find the probability that X greater than its mean.
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