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对于随机变量问题,其涉及的问题主要有体育竞赛、知识能力、投掷硬币、旅游交通、经济利润、产品抽取等为背景,这些背景在教材或高考复习中都能找到相关的习题,下面不妨走进离散型随机变量问题,来寻找解题策略.一、以体育运动(投篮、射击)为背景材料例1甲、乙两个篮球运动员互不影响地在同一位置投球,命中率分别为1/2与p,且乙投球2次均未命中的概率为1/16,(1)求乙投球的命中率p;(2)若甲投球1次,乙投球2次,两人共命中的次数记为ξ,求ξ的分布列和数学
For the problem of random variables, the main issues involved are sports competition, knowledge ability, coin throwing, tourism traffic, economic profit, product extraction and so on. These backgrounds can be found in the textbook or college entrance examination review the relevant exercises, the following may wish to go First, to sports (shooting, shooting) as the background material Example 1 A, B two basketball players in the same position without affecting each other hit the ball, the hit rates were 1 / 2 and p, and the probability of failing to hit the ball twice in the second round is 1/16, (1) to hit the ball hit rate B; b) Denoted as ξ, find the distribution of ξ and math