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标题: 牛人快看之二(最新JJ) [打印本页]

作者: ice    时间: 2002-8-8 22:32     标题: 牛人快看之二(最新JJ)

1.In skating, there are 6 female singles, 3 pairs and 5 male singles, in this order and succession,what is the total combination?

2.f(x)=x2 +2x+1, 问f(s) 与f(r)的算术平均值?
(1) r和 s的算术平均值为5;
(2) 0〈=r〈=s〈=10
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此题选E吗?

3.The probability of one product is found to be defective is 0.01, what is the probability that at least one product in 10 products is found to be defective.
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answer: 1-0.99^10
作者: tongxun    时间: 2002-8-8 23:09

1、有9女,8男。先取6女,C9,6。再取3男与剩下的3女配,C8,3;两者相乘。
   不过答案好象数字很大
2、E。因为不知道两者的乘积
3、取1个是好的几率0.99,2个0.99*0.99,10个0.99的十次方。至少有1个坏的,用1去减
个人意见,欢迎讨论!
作者: juleyi    时间: 2002-8-9 06:32

1. P6 6 * P3 3 * P5 5
2. E
3. C10 1 * 0.99^9 * 0.01
作者: primefang    时间: 2002-8-9 09:21

1  题目的要求不清楚啊
2  E
3  假设有100 product, so  there is one 1 defect, 要满足以上条件,计算公式为
= 1*C99,9/ C100,10= 0.1




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