作者penatnl (penatnl)
看板Statistics
標題[問題]一題期望值的問題
時間Sun Sep 14 14:34:16 2008
Suppose n balls are distributed at random into r boxes.
Let Xi=1 if box i is empty and =0 otherwise.
(1)compute E(Xi)
(2)For i=/=j(i不等於j) compute E(XiXj)
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