[理工] [機率]-求期望值

看板Grad-ProbAsk作者 (Daniel)時間13年前 (2010/09/15 23:21), 編輯推噓1(1推 0噓 2→)
留言3則, 2人參與, 最新討論串1/1
A fair coin is tossed until two tails occur successively. Find the expected number of the tosses required. Hint: Let 1 if the first toss result in tails. X = 0 if the first toss result in heads. and condition on X. 答案是 5 感謝幫忙回答的 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.40.119.222
推
09/15 23:51, , 1F
用條件期望值去做，不過細節我忘了
09/15 23:51, 1F
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09/16 00:17, , 2F
在數學版回答了...
09/16 00:17, 2F
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09/16 00:17, , 3F
09/16 00:17, 3F
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