[{"source":{"position":5,"lines":["如果随机变量的取值范围是\{$x_1,x_2..$\},且有$\\sum p(x)=1$的函数p，我们称这个函数是随机变量x的概率质量函数或是频率函数。有时候利用随机变量的累计分布函数比较方便。"],"changePosition":null},"target":{"position":5,"lines":["如果随机变量的取值范围是{$x_1,x_2..$},且有$\\sum p(x)=1$的函数p，我们称这个函数是随机变量x的概率质量函数或是频率函数。有时候利用随机变量的累计分布函数比较方便。"],"changePosition":null},"type":"CHANGE"},{"source":{"position":25,"lines":["$$\begin{gathered}p(k)=C(n,k)p\\^k(1-p)\\^\\{n-k\\}\end{gathered}$$"],"changePosition":null},"target":{"position":25,"lines":["$$\begin{gathered}p(k)=C(n,k)p^k(1-p)^\\{n-k\\}\end{gathered}$$"],"changePosition":null},"type":"CHANGE"},{"source":{"position":35,"lines":["$$\begin{gathered}p(k)=(1-p)\\^\\{k-1\\}p\end{gathered}$$"],"changePosition":null},"target":{"position":35,"lines":["$$\begin{gathered}p(k)=(1-p)^\\{k-1\\}p\end{gathered}$$"],"changePosition":null},"type":"CHANGE"},{"source":{"position":39,"lines":["$$\begin{gathered}P=\\sum (1-p)\\^j p=1\end{gathered}$$"],"changePosition":null},"target":{"position":39,"lines":["$$\begin{gathered}P=\\sum (1-p)^j p=1\end{gathered}$$"],"changePosition":null},"type":"CHANGE"}]