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      <pubDate>2025-09-30 02:42:09 UTC</pubDate>
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      <webMaster>hello@padlet.com</webMaster>
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         <title>histogram</title>
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         <title>box-plot</title>
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         <pubDate>2025-10-08 13:08:05 UTC</pubDate>
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         <title>regression/correlation</title>
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         <title>Venn diagram</title>
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         <description><![CDATA[<p>1. 基本概率公式</p><ul><li><p>﻿﻿概率的加法公式：P（AU B）=P（A）+P（B）-P（AnB）<br>解释：事件A或B发生的概率，等于A的概率加B的概率，减去A和B同时发生的概率（避免重复计算）。</p></li><li><p>﻿﻿互斥事件：若A和B互斥（AnB=9），则P（AUB）=P（A）+P（B）。</p></li></ul><p>2.条件概率公式</p><p>P（AIB）=P（ADB）（P（B）&gt;0）</p><p>P（B）</p><p>解释：在事件B发生的条件下，事件A发生的概率，等于A和B同时发生的概率除以B发生的概率。</p><p>3. 事件独立性公式</p><p>若A和B独立，则P（AnB）=P（A）× P（B），且P（AIB）=P（A），P（B|A） =P（B）。</p>]]></description>
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         <pubDate>2025-10-08 13:23:51 UTC</pubDate>
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         <title>discrete random variable</title>
         <author>2012895393</author>
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         <description><![CDATA[<p>期望是“取值×对应概率”的和，反映随机变量的平均水平；</p><p><br/></p><p><br/></p>]]></description>
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