问题
问答题
设随机变量X1，X2，…，Xm+n(m＜n)独立同分布，其方差为σ2，令
求：
1.D(Y)，D(Z)；
答案
参考答案：因为X1，X2，…，Xm+n相互独立，
搜题请搜索小程序“爱下问搜题”
设随机变量X1，X2，…，Xm+n(m＜n)独立同分布，其方差为σ2，令
求：
1.D(Y)，D(Z)；
参考答案：因为X1，X2，…，Xm+n相互独立，
It is possible that the majority of the teenagers accepted the advantages of the iPad. In most cases they were expressing strong opinions about it. But today we already know that another three high-end computer tablets(平板电脑) are going on sale, with the aim of taking a bite out of the iPad's market. For tablet computer fans, iPad may not be the only choice, as the Motorola Xoom, the HP Touchpad and the BlackBerry PlayBook will have been launched (推出)by this summer, according to foreign media reports on Tuesday. Here is Product Information Guide as follows. We would like to listen to your reviews later.
A. Apple ipad 2 has excellent data security. B. Four t  ypes above of Battery life are the same.C. Most people are satisfied with HP Touchpad. 小题3: Which one can you buy as a present with only 4000yuan RMB at  hand?
|