GMAT数学常用词汇及概念汇总(五)
<p> 考生在备考<span word="GMAT">GMAT</span>数学考试时，除了要通过大量练习来掌握<span word="GMAT">GMAT</span>数学的解题方法和技巧外，还需要对<span word="GMAT">GMAT</span>数学考试中经常用到的一些基本词汇和概念进行记忆，以辅助<span word="GMAT">GMAT</span>数学备考工作的进行。下面留学将对<span word="GMAT">GMAT</span>数学考试中经常用到的一些词汇和基本概念进行归纳，以供广大考生参考。</p><p> 其中1<span word="st">st</span> <span word="Quartile">Quartile</span>的<span word="k">k</span>%=25%</p><p> 2<span word="nd">nd</span> <span word="Quartile">Quartile</span>的<span word="k">k</span>%=50%</p><p> 3<span word="rd">rd</span> <span word="Quartile">Quartile</span>的<span word="k">k</span>%=75%</p><p> 计算结果一样。</p><p> 例：</p><p> {1，3，4，5，6，7，8，9，19，29，39，49，59，69，79，80｝共16个样本</p><p> 30%：30%=4.5=4+0.5</p><p> 第5个数+0.5第6个数=0.56+0.57=6.5</p><p> 75%：1575%=11.25=11+0.25</p><p> 第12个数+0.25第13个数=0.7559+0.2569=51.5</p><p> 中数<span word="median">median</span>： <span word="a">a</span> <span word="value">value</span> <span word="in">in</span> <span word="an">an</span> <span word="ordered">ordered</span> <span word="set">set</span> <span word="of">of</span> <span word="values">values</span> <span word="below">below</span> <span word="and">and</span> <span word="above">above</span> <span word="which">which</span> <span word="there">there</span> <span word="is">is</span> <span word="an">an</span> <span word="equal">equal</span> <span word="number">number</span> <span word="of">of</span> <span word="values">values</span> <span word="or">or</span> <span word="which">which</span> <span word="is">is</span> <span word="the">the</span> <span word="arithmetic">arithmetic</span> <span word="mean">mean</span> <span word="of">of</span> <span word="the">the</span> <span word="two">two</span> <span word="middle">middle</span> <span word="values">values</span> <span word="if">if</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="one">one</span> <span word="middle">middle</span> <span word="number">number</span>。即一个顺序排列数集的中间数，如果数序列为奇数，则中间的数为中数，如果数序列为偶数，则中间两数的平均数为中数。</p><p> 平均数，指的是所有数的平均。</p><p> 众数，指的是数集中出现频率最高的数。</p><p> 值域，指的是数集中最大数减最小数。即</p>
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