题目内容：
People who walk on the grass are liable（ ）a fine of$5.
to
答案解析：
选择题：People who walk on the grass are liable（ ）a fine of$5.to
- 题目分类：研究生入学
- 题目类型：选择题
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Paul strongly denied that he was guilty（ ）cheating innocent customers.for
Paul strongly denied that he was guilty（ ）cheating innocent customers.for
In some cases,different approaches（ ）conflicting theories.the same scientific pr
In some cases,different approaches（ ）conflicting theories.the same scientific problem lead toto
I subscribe（ ）one daily newspaper and one weekly magazine.to
I subscribe（ ）one daily newspaper and one weekly magazine.to
设随机变量X，Y的概率分布相同，X的概率分布为P（X＝0）＝1/3，P（X＝1）＝2/3，且X，Y的相关系数ρXY＝1/2。（Ⅰ）求二维随机变量（X，Y）的联合
设随机变量X，Y的概率分布相同，X的概率分布为P（X＝0）＝1/3，P（X＝1）＝2/3，且X，Y的相关系数ρXY＝1/2。（Ⅰ）求二维随机变量（X，Y）的联合概率分布；（Ⅱ）求概率P（X＋Y≤1）。
设二维离散型随机变量（X，Y）的概率分布如表1所示。表1求：（Ⅰ）P{X＝2Y}；（Ⅱ）Cov（X－Y，Y）。
设二维离散型随机变量（X，Y）的概率分布如表1所示。表1求：（Ⅰ）P{X＝2Y}；（Ⅱ）Cov（X－Y，Y）。