作者love113w (free)
看板Statistics
標題[問題] 機率問題
時間Tue Aug 2 12:07:46 2016
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A company takes out an insurance policy to cover accidents that occur at its
manufacturing plant. The probability that one or more accidents will occur
during any given month is 0.60. The numbers of accidents that occur in different months
are mutually independent.
Calculate the probability that there will be at least four months in which no
accidents occur before the fourth month in which at least one accident occurs.
解答是算
in the first seven months there must be at least four with no accidents
為何是7個月阿? 題目內好像也沒有提到
謝謝
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1F：→ kerwinhui: generalised pigeonhole...7個月一定是有4個月無意外或 08/02 12:45
2F：→ kerwinhui: 4個月有意外 08/02 12:45
3F：→ kerwinhui: (至少4個月) 08/02 12:46
4F：→ kerwinhui: 6個月還有可能是3-3 08/02 12:46
5F：→ love113w: 抱歉 本人有點笨... 請問一下 generalised pigeonhole 08/02 14:09
6F：→ love113w: 是甚麼意思呢? 然後又是如何看出來要算7個月? 謝謝 08/02 14:10
7F：→ wwfc: 這題用到鴿籠原理，好高深… 08/04 17:03