GMAT数学基础知识介绍：统计
<p> 很多新手对于<span word="GMAT">GMAT</span>数学不是十分自信，究其原因往往就是是由于对于<span word="GMAT">GMAT</span>数学知识点没有复习，而直接做题，为此小编特收集整理了关于统计的<span word="GMAT">GMAT</span>数学知识点，分享给大家，希望对大家有所帮助，文中观点仅供参考。</p><p> 1. <span word="arithmetic">arithmetic</span> <span word="mean">mean</span> : 算术平均值</p><p> 2. <span word="median">median</span>: 中位数</p><p> ①<span word="The">The</span> <span word="median">median</span> <span word="is">is</span> <span word="the">the</span> <span word="middle">middle</span> <span word="value">value</span> <span word="of">of</span> <span word="a">a</span> <span word="list">list</span> <span word="when">when</span> <span word="the">the</span> <span word="numbers">numbers</span> <span word="are">are</span> <span word="in">in</span> <span word="order">order</span>.</p><p> ②先排序，后取中。比如说一个数列{1，2，4，5，3}，求它的中间数时，应该先排序变成{1，2，3，4，</p><p> 5}，然后取中为 3。如果数列含有偶数个数，取中间两个数，然后取这两个数的算术平均。</p><p> 3. <span word="mode">mode</span>: 众数</p><p> ① <span word="The">The</span> <span word="mode">mode</span> <span word="of">of</span> <span word="a">a</span> <span word="list">list</span> <span word="of">of</span> <span word="numbers">numbers</span> <span word="is">is</span> <span word="the">the</span> <span word="number">number</span> <span word="that">that</span> <span word="occurs">occurs</span> <span word="most">most</span> <span word="frequently">frequently</span> <span word="in">in</span> <span word="the">the</span> <span word="list">list</span>.</p><p> ② <span word="A">A</span> <span word="list">list</span> <span word="of">of</span> <span word="numbers">numbers</span> <span word="may">may</span> <span word="have">have</span> <span word="more">more</span> <span word="than">than</span> <span word="one">one</span> <span word="mode">mode</span>.</p><p> 4. <span word="expectation">expectation</span>: 期望</p><p> 在 <span word="GMAT">GMAT</span> 数学中，期望就是算术平均值。</p><p> 5. <span word="deviation">deviation</span> 偏差</p><p> <span word="di">di</span>=<span word="ai">ai</span>-<span word="E">E</span></p><p> 6. <span word="variance">variance</span> 方差</p><p> 1<span word="n">n</span>2</p><p> <span word="D">D</span> = </p><p> <span word="n">n</span> <span word="i">i</span> =1</p><p> 7. <span word="standard">standard</span> <span word="deviation">deviation</span> 标准差</p><p> <span word="s">s</span>= <span word="D">D</span></p><p> 例：Ⅰ.72,73,74,75,76</p>
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