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标 题Re: [问题] 机统问题
发信站次世代BS2 (Fri Oct 21 02:11:45 2005)
转信站ptt!Group.NCTU!grouppost!Group.NCTU!BS2
※ 引述《[email protected] (没有动力阿....= =)》之铭言:
> 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)能够再三天内将三封信的两封传到B城市的可能性是多少?
二项分布.
> (b)If the 3 letters are mailed together at the same time and location, how
> does your conclusion in part a change? Explain.
同时寄可能一起遗失或一起延误.
换言之, 二项分布的条件不再成立.
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