GMAT考试数学概念和名词汇总（十六）
<p> 8.计量单位</p><p> <span word="cent">cent</span> 美分 <span word="penny">penny</span> 一美分硬币 <span word="nickel">nickel</span> 5美分硬币 <span word="dime">dime</span> 一角硬币 <span word="dozen">dozen</span> 打 <span word="score">score</span> 廿 <span word="Centigrade">Centigrade</span> 摄氏 <span word="Fahrenheit">Fahrenheit</span> 华氏 <span word="quart">quart</span> 夸脱 <span word="gallon">gallon</span> 加仑 <span word="yard">yard</span> 码 <span word="meter">meter</span> 米 <span word="micron">micron</span> 微米 <span word="inch">inch</span> 英寸 <span word="foot">foot</span> 英尺 <span word="minute">minute</span> 分<span word="square">square</span> <span word="measure">measure</span> 平方单位制 <span word="cubic">cubic</span> <span word="meter">meter</span> 立方米 <span word="pint">pint</span> 品脱</p><p> 基本规律</p><p> 2 所有的质数都是奇数，但奇数不一定是质数</p><p> 2 若<span word="ba">ba</span>，则<span word="b">b</span>/<span word="a">a</span> 若<span word="b">b</span></p><p> </p><p> <span word="GRE">GRE</span>中容易考到的统计题型主要就有以下七种</p><p> 1. <span word="mode">mode</span></p><p> 一堆数中出现频率最高的一个或几个数<span word="e">e</span>.<span word="g">g</span>. <span word="mode">mode</span> <span word="of">of</span> 1,1,1,2,3,0,0,0,5 <span word="is">is</span> 1 <span word="and">and</span> 0</p><p> 2。<span word="range">range</span> 一堆数中最大和最小数之差 <span word="e">e</span>.<span word="g">g</span>. <span word="range">range</span> <span word="of">of</span> 1,1,2,3,5 <span word="is">is</span> 5-1=4</p><p> 3。<span word="mean">mean</span> <span word="arithmatic">arithmatic</span> <span word="mean">mean</span></p><p> <span word="geometric">geometric</span> <span word="mean">mean</span> <span word="n">n</span>个数之积的<span word="n">n</span>次方根</p><p> 4。<span word="median">median</span></p><p> 将一堆数排序之后，正中间的一个数， 或者中间两个数的平均数<span word="e">e</span>.<span word="g">g</span>. <span word="median">median</span> <span word="of">of</span> 1,7,4,9,2,5,8 <span word="is">is</span> 5 <span word="median">median</span> <span word="of">of</span> 1,7,4,9,2,5 <span word="is">is</span> /2=6</p><p> 5。<span word="standard">standard</span> <span word="error">error</span></p><p> 一堆数中，每个数与平均数的差的绝对值之和，除以这堆数的个数</p><p> <span word="e">e</span>.<span word="g">g</span>. <span word="standard">standard</span> <span word="error">error</span> <span word="of">of</span> 0,2,5,7,6 <span word="is">is</span>: /5=2.4</p><p> 6。<span word="standard">standard</span> <span word="variation">variation</span></p><p> 一堆数中，每个数与平均数之差的平方之和，再除以<span word="n">n</span> <span word="e">e</span>.<span word="g">g</span>. <span word="standard">standard</span> <span word="variation">variation</span> <span word="of">of</span> 0,2,5,7,6 <span word="is">is</span>: _ 2 2 2 2 2_</p>
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