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一 频 率 二 概 率 P&S§4频率与 概率目录索引第一章概率与随机事件返回主目录一 、 频率1) 频率的定义和性质 P&S定义在相同的条件下,进行了n 次试验, 在这 n 次试验中,事件 A 发生的次数 nA 称为事件 A 发生的频数。比值 n A/ n 称为事件A 发生的频率,并记成 fn(A) 。第一章概率与随机事件返回主目录P&S第一章概率与随机事件 它具有下述性质:返回主目录25124
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负责做准备一代代文学作品
at the momentswitch1. switch onoff=turn onoffJack switched (turned) on hisputer and checked his mail. 2. switch overPlease switch over to CCTV . switch from…to…He could switch easily from French t
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