试题与答案

材料一：东莞人口主要数据（摘自东莞市统计局2011年5月23日公布的东莞市2010年

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题目：

材料一：东莞人口主要数据（摘自东莞市统计局2011年5月23日公布的东莞市2010年第六次全国人口普查报告，以下简称为“六普”，其中常住人口主要包括户籍人口和非户籍人口）

材料二：东莞总人口的性别比从由五普的89.42上升为六普的117.81（而根据2010年统计年报显示，户籍人口的性别比为103.09），专家认为：这与东莞产业的适度重型化有关。

材料三：对于这座GDP已跻身“4000亿元俱乐部”的新型城市（下图为珠三角区域图），东莞该能容纳多少人口？2008年3月28日，东莞市副市长梁国英表示，“东莞有600万人口是最合适的！”。

材料四：2011年1月，东莞市市长李毓全就提老高百姓的幸福指数提出自己看法：第一，要使他们有富裕感。往后这五年，我们还要在经济发展的同时，继续提高市民的收入；第二，使他们有安全感。我们要加倍努力，使市民的安全感好上加好；第三，要使他们有实惠感。不单是收入，还有管理.公共服务.读书.文化.社会保障等，都要让每个市民感到实惠。

结合材料和相关背景知识，分析材料三中提到的“600万人口”这一数据提出有哪些可能依据。

答案：

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参考答案：在利用决策树解题时，应从决策树末端起，从后向前，步步推进到决策树的始端。在向前推进的过程中，应在每一阶段计算事件发生的期望值。计算完毕后，开始对决策树进行剪枝，在每个决策结点删去除了最高...

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