请教个比较简单的probably问题

老板问，
if a mutation is present at a frequency of 0.001 (1 in 1000) in a population, and I draw 1000 subjects at random from that population, what is the probability that I will see the mutation (in any subject) in the selected 1000 subjects?

what if I pick 2000 subjects at random?

谢谢...

所有跟帖： 

• 不出现的probability是 （1-0.1%)^n -haha2000- ♂ (0 bytes) () 01/23/2009 postreply 06:17:45

• 谢谢，谢谢。后来我也想到了。可是 -家有香猪- ♀ (56 bytes) () 01/23/2009 postreply 06:36:46

• 怎么做容易就怎么做呗。 -贫论元- ♂ (62 bytes) () 01/23/2009 postreply 08:25:04

• 问你呢，haha -康MM- ♀ (0 bytes) () 01/24/2009 postreply 14:31:03

• 新年快乐 -haha2000- ♂ (42 bytes) () 01/24/2009 postreply 17:04:42