虽然新版gre数学考试难度系数增大,但是新版gre数学最大也跑不出高三知识范围,在这里小编提醒考生的是,难度对我们不构成威胁,作为考生要把的强项发挥到极致,把新版gre数学正态分布部分经常考察的考点弄明白。
高斯分布的概率密度函数为一钟型曲线,即
a为均值, 为标准方差,曲线关于x=a的虚线对称, 决定了曲线的胖瘦,形状为:
高斯型随机变量的概率分布函数,是将其密度函数取积分,即:
表示随机变量A的取值小于等于x的概率。比如A的取值小于等于均值a的概率是50%。曲线为
以上是有关备考新gre数学考试常用知识概率的基本介绍,小编认为备考新gre考试的考生,不需要浪费太多的时间在备考新gre数学上,因为数学使我们的强项,但是也不能疏忽大意,要不基本的数学知识词汇弄清楚,难点要攻克,争取把我们的优势发挥到最好。
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