GRE数学考试误区分析
<p> <span word="GRE">GRE</span>数学误区1、余数一定是大于等于0的.</p><p> 比如,-17除以7,商-3余4,而不是像我们很多人那样想的商2余-3</p><p> <span word="GRE">GRE</span>数学误区2、大学学理工科的同学不要被大学实验课其他相关课程的四舍五入概念混淆头脑就用最简单的,如果尾数是5,四舍五入就进位.</p><p> 而大学里学的是,尾数是5,如果前面为奇,进位成偶数;如果前面为偶,不变,舍去.简单来讲就是四舍五入后让尾数是偶数的原则.</p><p> <span word="GRE">GRE</span>数学误区3、关于四分位差<span word="interquartile">interquartile</span> <span word="range">range</span>,百度百科所说的用法和<span word="GRE">GRE</span>中的用法不同.根据<span word="OG">OG</span>,四分位数有很多算法,但是<span word="GRE">GRE</span>采取的哪一种,大家务必明确记住啊.</p><p> 【四分位数是将一组数据由小到大排序后,用3个点将全部数据分为4等份,与这3个点位置上相对应的数值称为四分位数,分别记为<span word="Q">Q</span>1、<span word="Q">Q</span>2、<span word="Q">Q</span>3.其中,<span word="Q">Q</span>3到<span word="Q">Q</span>1之间的距离又称为四分位差,记为<span word="Q">Q</span>.四分位差越小,说明中间部分的数据越集中;四分位数越大,则意味着中间部分的数据越分散.】</p><p> 具体四分位数的题目,在<span word="Math">Math</span> <span word="Review">Review</span>有详解~感谢童鞋们的样题解析,看这里<span word="OG">OG</span>中一道<span word="data">data</span> <span word="analysis">analysis</span>数学题</p><p> <span word="P">P</span>296中一道关于计算 <span word="interquartile">interquartile</span> <span word="range">range</span>的题目,原题如下：2. <span word="The">The</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="passengers">passengers</span> <span word="on">on</span> 9 <span word="airline">airline</span> ?<span word="ights">ights</span> <span word="were">were</span> 22, 33, 21, 28, 22, 31, 44,) 50, <span word="and">and</span> 19. <span word="The">The</span> <span word="standard">standard</span> <span word="deviation">deviation</span> <span word="of">of</span> <span word="these">these</span> 9 <span word="numbers">numbers</span> <span word="is">is</span> <span word="approximately">approximately</span>.</p>
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