[問題] 統計混合分配
各位好~想請教一題統計學問題，題目如下：《出處：http://ppt.cc/HXXE》
A total of n people have been invited to a party honoring an important
official. The party begins at time 0. The arrival times of the n guests
are independent exponential random variables with mean 1, and the
arrival time of the official is uniformly distributed between 0 and 1.
a. Find the probability that exactly k of the guests arrive before the
official.
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目前解答有兩種版本~
不會用批踢踢打數學算式...所以我直接給PFD檔...
http://ppt.cc/29Av
個人覺得版本I正確，但又說不出版本II哪裡有問題...
想請問各位癥結點在哪...謝謝！
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