【单选题】【消耗次数：1】
小概率事件是指发生概率小于（ ）的事件：
①
0.1
②
0.05
③
0.2
④
0.005
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小概率事件在统计学上的含义是（）。
①
指发生概率P≥0.5的随机事件
②
指一次实验或者观察中绝对不发生的事件
③
在一次实验或者观察中发生的可能性很小的事件，一般指P≤0.05
④
在一次实验或者观察中发生的可能性较大的事件，一般指P0.05
⑤
以上说法均不正确
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设在每次试验中，事件A发生的概率为p,则在n次独立重复试验中，事件A至少发生一次的概率是[填空]
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