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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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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 |
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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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