概率论与数理统计第四章第3题

<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;"> <span>1、&nbsp; </span>一对恋人甲乙由于种种原因在现实中不得不分居两地，他们相约在<span>2046</span>年<span>3</span>月<span>18</span>日<span>12:00~13</span>：<span>00</span>在火车站会面，设<span>X</span>、<span>Y</span>分别是甲、乙到达的时间，且甲乙并未通过其他方式进行联系，已知<span>X</span>、<span>Y</span>的概率密度分别为：<span></span> </p> <p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:0cm;"> <span style="font-size:9.0pt;font-family:&quot;"></span><img src="http://tk.hustoj.com/attached/image/20140420/20140420083738_15335.png" alt="" /> </p> <p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:0cm;"> 求先到达者需要等待的时间的数学期望。 </p> <p> <br /> </p>

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