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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
跪求 機率分配
Jun 28th 2013, 17:56

老師出了四題統計學
麻煩請教我算和解答可以嗎??
跪求!感謝!贈10點

1 .設一 r.v.X~b(20,0.2)求
(1)X之機率分配f(x)=???
(2)P(X<3)=???
(3)X知期望值E(X)=???
(4)X知變異數Var(X)=???

2. 設有生產線,生產不良品機率為0.02,現由此生產線生產1000個產品,隨機變異數X表示不良品的個數,求
(1)r.v.X~???
(2)E(X)=???
(3)Var(X)=???

3. 設一r.v.X~N(5,4),求
(1)X之機率分配f(x)=???
(2)P(X<3)=???
(3)E(X)=???
(4)Var(X)=???

4. 一家雜誌社欲知讀者平均年齡,以做為雜誌內容走向的參考,根據其對訂閱戶抽查所得的讀者平均年齡為36歲
(1)當樣本數為49,母體標準差為6歲,求該雜誌讀者平均年齡的95%信賴區間=?
(2)當樣本數為25,母體分配為常態,樣本標準差為6歲,求該雜誌讀者平均年齡的95%信賴區間=?

5. 某釣魚用的細繩強度呈現常態分配,經試驗5次得強度分析別如下(單位:公斤)
4.1,3.9,3.8,4.5,4.6,求
(1)此細線平均強度之95%信賴區間

跪求,急求,感謝

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2016韓劇排行榜前十名 , 好看的韓劇推薦 , 2016韓劇收視率 , 韓劇推薦 , 2016好看的韓劇推薦 , 好看的韓劇推薦20162016韓劇,好看的韓劇,韓劇推薦,日劇推薦 ...

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