题库搜索>问题求解PS-13418
A string of 10 lightbulbs is wired in such a way that if any individual lightbulb fails, the entire string fails. If for each individual lightbulb the probability of failing during time period T id 0.06, what is the probability that the string of lightbulbs will fail during time period T?
分析A选项
分析B选项
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分析D选项
分析E选项
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灯泡坏掉的概率等于1减去灯泡亮的概率
灯泡一直亮的概率是十盏灯每盏灯都亮着 也就是（1-0.06）^10
默默哒
楼上答案是错误的。 用正难则反来算：a string of 灯泡都坏，里面可能是一只坏，或两只坏，或三只坏....? 正的算比较难算。 所以要反着算：用1减去所有灯泡都是好的概率就是一串灯泡坏的概率（因为不管里面几只坏了，一串灯泡都是坏了） 所有灯泡都好的概率是（1-0.06）^10 所以答案应该是 E ： 1-(0.94)^10
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2017-10-04 10:44:32
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