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求离散型随机变量的分布列,应按以下三个步骤进行:(1)明确离散型随机变量的所有可能取值,以及取每个值所表示的意义;(2)利用概率的有关知识,求出随机变量每个取值的概率;(3)按规范形式写出分布列,并用分布列的性质进行检验.一、明确离散型随机变量的所有可能取值,严格遵循三个步骤,做好一般性问题例1一袋中装有5只球,编号为1,2,3,4,5,在袋中同时取3只,以ξ表示取出的3只球中的最小号
To find out the distribution of discrete random variables, we should do the following three steps: (1) Define all the possible values of the discrete random variables and take the meaning of each value; (2) Use the relevant knowledge of probability, Find out the probability of each value of the random variable; (3) Write the distribution column according to the standard form, and test it by the properties of the distribution column: 1. Clear all the possible values of the discrete random variable, strictly follow the three steps Good General Problem Example 1 A bag contains 5 balls, numbered 1, 2, 3, 4, and 5, and 3 in the bag at the same time, with ξ representing the smallest of the 3 balls taken