作者kkknee (撑)
看板Statistics
标题[问题] 机率问题
时间Tue Feb 19 22:19:27 2008
A coin, with diameter of 2cm, is dropped into a empty can,
whose round bottom has a daimeter of 10cm
(1).What is the probability that the center of the can bottom is
covered by the coin?
(2).Assuming independence, how many coins would you have to drop
to have at least a 50% chance of covering the can bottom?
第一题 我的答案是 4/25
至於第二题 不知从何下手,请各位先进同好们赐教
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