| 摘要: |
| 分别用定义法和随机变量和式分解法计算得到一个离散型随机变量的数学期望.其中,定义法计算过程步骤多,公式的转化和运算灵活,而随机变量和式分解法利用变量分解技巧,降低了计算难度. |
| 关键词: 随机变量 数学期望 定义法 随机变量和式分解法 |
| DOI： |
| 投稿时间：2012-04-07 |
| 基金项目:嘉应学院自然科学研究项目资助。 |
|
| Calculation of Mathematical Expectation for a Discrete Random Variable |
|
DEND Chun-liang
|
| (College of Mathematics, Jiaying University, Meigzhou, Guangdong, 514015, China) |
| Abstract: |
| The mathematical expectation for a discrete random variable was calculated by means of both the defined method and the sum of random variables decomposition.During the calculation process, the defined method has many steps, and the transformation of the formula and computation are flexible, while the sum of random variables decomposition reduces the computational difficulty by using the variable decomposition technique. |
| Key words: andom variable mathematical expectation defined method the sum of random variables decomposition |
