作者penatnl (penatnl)
看板Statistics
标题[问题] 机率的问题
时间Thu Mar 12 01:21:42 2009
1. a set of 200 people , consisting of 100 men and 100 women ,
is randomly divided into 100 pairs of 2 each
我想问的是 请问抽出一对是男女配的机率为何??
我直觉是100/199 可是答案说50/199 想不通
2.the male offspring of two carriers is not diseased , what is
the probability that he is a carrier ?
AA = not carrier , not diseased
aa = diseased and dies before it mates
Aa = carriers , not diseased
这题不是问假如爸妈都是Aa 那他Aa的机率是多少吗??? 为什麽答案
P(Aa∣AA Aa) = 2/3
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