设随机变量X与Y相互独立,已知X服从参数为1的指数分布,P(Y=-1)=3/4,P{Y=1}=1/4,则P{2X≤Y+3}=____。
如图
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Choose the closest paraphrased version after the following sentence or the italicized part. Blacken the letter corresponding to your choice on the ANSWER SHEET.
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