回复：P(E)=0.9*(10/60)=.15

来源: calligraphy 于 2011-01-28 05:22:51 [] [旧帖] [给我悄悄话] 阅读数 : (132 bytes)
回答: P(E)=0.9*(10/60)=.15 由 jinjing 于 2011-01-27 20:06:49

I came up with .15 too. But this is a wrong answer. Later on I googled "probability of shooting star", I know the answer now.

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• 好题。 呵呵 -guest007- ♂ 给 guest007 发送悄悄话 (0 bytes) () 02/04/2011 postreply 12:50:59

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