※ 引述《[email protected] (沒有動力阿....= =)》之銘言： > An engineer want to move across the country from A to B to work. On > different days,she mails a letter and resume to 3 different companies in B. > Suppose that a letter sent from A to B has a probability of 0.7 of reaching > B within 3days. > (a)能夠再三天內將三封信的兩封傳到B城市的可能性是多少? 二項分布. > (b)If the 3 letters are mailed together at the same time and location, how > does your conclusion in part a change? Explain. 同時寄可能一起遺失或一起延誤. 換言之, 二項分布的條件不再成立. -- 統計大家談! 請到: 交大資訊次世代 telnet://bs2.twbbs.org Statistics (統計與機率) 盈月與繁星 telnet://ms.twbbs.org Statistics (統計：讓數字說話) 無名小站 telnet://wretch.twbbs.org Statistics (統計方法討論區) 成大計中站 telnet://bbs.ncku.edu.tw Statistics (統計方法及學理討論) 批踢踢實業站 telnet://ptt.twbbs.org Statistics (統計學及統計軟體版) -- ▄▄▄▄▄▄▄ ▄▄▄▄ ▄▄▄▄▄▄ ＜telnet://bbs.cs.nctu.edu.tw＞ █▄▄▄▄█ █ ▄▄▄▄▄█ Player: yhliu ▄█▄▄▄▄█ ▄▄▄█ █▄▄▄▄▄ From: 163.15.188.87 ☆ 次世代ＢＳ２ ☆ 可申請個人板 150MB 超大相簿 http://pic.bs2.to 資訊人 250MB