已知随机变量ξ和η,其中η=10ξ+2,且E(η)=20,若ξ的分布列如下表,则m的值为()ξ1234P14mn112A.4760B.3760C.2760D.18-高二数学

题目简介

已知随机变量ξ和η,其中η=10ξ+2,且E(η)=20,若ξ的分布列如下表,则m的值为()ξ1234P14mn112A.4760B.3760C.2760D.18-高二数学

题目详情

已知随机变量ξ和η,其中η=10ξ+2,且E(η)=20,若ξ的分布列如下表,则m的值为(  )
ξ1234
Phttp://www.mofangge.com/html/qDetail/02/g2/201406/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAAkCAYAAACE7WrnAAAAWElEQVRIiWNgGAWDAygpKf2n2AAYHhwuGjWIjgYhRz9Vk8EooDJQVFR8TgwmaJCCgoIEMZgOfhpyYPBkXJghVCkBKHYRsuaBNwhdI8UuonoJSdXoH5plNgD2tEPJ5Pi/1wAAAABJRU5ErkJggg==mnhttp://www.mofangge.com/html/qDetail/02/g2/201406/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAkCAYAAAB8DZEQAAAAbklEQVRIiWNgGAWjAB9QUlL6T1PDYZhmliBbNmrJqCXUNxwd08yyUTBMgaKi4nNKMUFLFBQUJCjFdAiLUUAPgKucoko5hs8QdDGKC8wBs4QcNRQZQJW6BZ8hVKu88KUuqliAyzCqRTy+en1k1/kALTZg00zyOd0AAAAASUVORK5CYII=
A.https://img.360youke.com/images/upload/03/4751/11567961tpagvxshy3e.pngB.C.D.
题型:单选题难度:中档来源:不详

答案

A

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