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标题: 钱永强section3-7 [打印本页]

作者: 卡通猫王    时间: 2006-9-4 07:11     标题: 钱永强section3-7

X ,Y and Z each try independently to solve a problem .If their individual probabolity for success are ¼,1/2 and 5/8 ,respectively, what is the probabolity that X and Y ,but not Z ,will solve the problem.

(a)    11/8 (b) 7/8 (c) 9/64(d)5/64(e)3/64

answer (e)

能不能帮忙解释一下。为何是1/4x1/2x3/8=3/64 没有解题的思路。谢谢
作者: himba    时间: 2006-9-4 13:24

其实这题和抛3次硬币的题有点类似,不同的只是每次的正反概率不同了.

X,Y参加,所以取他们的正概率即成功的概率,Z不参加,所以取他的非正概率,即1-5/8=3/8, 3者乘之即得.






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