江湖救急12年级data

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边缘徘徊 - 对话与故事 生命的全部

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3. This is a fair game: (5/11 X 30) - (6/11X25) = 0
 
4a. P = 52/54 X 12/54 X 11/54 X 10/54
 
4b. P = 52/55 X 12/55 X 11/55 X 10/55 + 1/55 X 52/55 X 12/55 X 11/55
 
4c. 把4b里的算算就知道了...
 
第5题还要写么?

边缘徘徊 - 对话与故事 生命的全部

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5a. 这是哪种概率分配?你英文自己解释...书里肯定有...
 
5b. total = C9-3 = 84
1 senior: 5 X 6(C4-2) = 30     (p = 30/84)
2 seniors: 10(C5-2) X 4 = 40   (p = 40/84)
3 seniors: C5-3 = 10    (p = 10/84)
0 senior: C4-3 = 4    (p = 4/84)
     
 

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