求成功的概率

来源:百度知道 编辑:UC知道 时间:2024/05/15 06:06:03
trao and hanako independtly try to decode a code message.the probabilities that trao and hanako are successful are 0.8 and 0.7,respectively .what is the probability that at least one of them decodes the message?

两个人都做不出的概率是(1-0.8)*(1-0.7)=0.06,至少一个做出概率是1-0.06=0.94
不用翻译成英语吧

trao与hanako之间at least one of them decodes the message ,也就是说他们中要麽trao解决hanako没有解决,他们概率是0.8×(1-0.7);或trao没有解决hanako解决,他们概率是0.7×(1-0.8);或trao and hanako都解决,他们概率是0.8×0.7,这三种情况。至少一个做出概率是上三种情况,和是0.94