下面为大家整理了新GRE数学注意点,有可能是我们平常没有注意的GRE数学误区。GRE数学复习对于各位考生来说说相对简单,但正因为简单,同学们才容易误入GRE数学考试复习的误区。
1.余数一定是大于等于0的。
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
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。
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。
3.关于四分位差interquartile range,百度百科所说的用法和GRE中的用法不同。根据OG,四分位数有很多算法,但是GRE采取的哪一种,大家务必明确记住啊。
【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Q1、Q2、Q3。其中,Q3到Q1之间的距离又称为四分位差,记为Q。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。】
4.关于正态分布,请注意区分标准正态分布和一般正态分布。
标砖正态分布:The standard normal distribution has mean 0 and standard deviation 1. The following figure shows the distribution, including approximate probabilities corresponding to the six intervals shown.,那张正态分布图上的0.02、0.14、0.34这些数据都要记下来~据说前面几场考试有涉及。
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