GRE
The standard deviation of data set X
The standard deviation of data set Y
The median of the distribution of X
-$$\frac{9}{5}$$
$$\frac{(5!+6!)}{(6!+7!)}$$
$$\frac{1}{6}$$
20!+19!+18!
400(18!)
$$\frac{1}{3^{n}}$$
$$3(\frac{1}{4^{n}})$$
$$(x-y)^{2}$$
3
x
112
100!
$$(50!)^{2}$$
p
1-p
$$\frac{r}{t}$$
0
25000 +道题目
198本备考书籍