设ξ为随机变量,k为任意常数,证明D(kξ)=k2Dξ.
D(kξ)=E[(kξ)一E(kξ)]2 =E[(kξ)-k(Eξ)]2 =E[k2(ξ-Eξ)2] =k2E(E-Eξ)2 =kDξ 分析 考生应掌握方差的特性.
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/272808.html
上一篇:portray, portrayed, are portrayed; into, to, withCelebrities ____ as glowing examples of perfection when they get awards, or as decadent or immoral if they become associated ____ a scandal.
下一篇:在估算资源需求情况时,需要了解在规划的活动进行期间内()。