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國際金價跌破1200美元 續創近3年新低
Jun 28th 2013, 05:13

【陳智偉/綜合外電報導】美、日經濟數據優於預期,進一步削弱黃金投資魅力,黃金現貨繼周四收盤挫逾2%,周五一度續跌1.7%,跌破1200美元,來到每盎司1180.5美元,創2010年8月來,也就是近3年新低。
 
黃金現貨近10個交易日有9個交易日走跌,本季跌幅約25%,將創歷來單季最大跌幅,分析師悲觀預期,有可能回測800美元關卡,也就是2008年12月以來新低。
 
想看更多有趣訊息,快上「蘋果搖錢樹」粉絲團

美日經濟氣色佳,黃金避險需求降低,周五國際金價跌破1200美元,每盎司1180.5美元創3年新低。 資料照片

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Changes are afoot at Blogtrottr!
By popular request, we're bringing in paid plans with some cool new features (and more on the way). You can read all about it in our blog post.
<<蘋果日報>>即時新聞-社會
>即時新聞-社會
海巡巡護九號船今成軍 明啟程護漁
Jun 28th 2013, 04:46

【石秀華/高雄報導】海岸巡防署海洋巡防總局所屬直屬船隊「巡護九號」船今舉行成軍典禮,1000噸級的「巡護九號」,船長84.5公尺,船速20節,船上配備海水汲泡沫消防系統,噴水槍4支,水平射程70公尺以上,船上飲用淡水設計容量,可供40人在海上持續執行45天的任務。
 
「巡護九號」明日上午啟程前往南方與菲律賓重疊的經濟海域,執行成軍後的首次護漁任務,預計1周後返航。

《蘋果》G+搬家囉!快點+1下

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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
統計學問題 求解(5題)
Jun 27th 2013, 15:52

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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