设随机变量ξ的概率密度函数为f(x)= ,x∈(-∞,+∞),若η—N(0,1),则η等于

A. B. C. D.

答案

解析

:因为f(x)=,x∈(-∞,+∞),

所以μ=-3,σ=,故η=.

相关题目

Mr. Smith worked in a post office and three years ago, when he was sixty, he re

Mr. Smith worked in a post office and three years ago, when he was sixty, he retired. So he has a lot of free time now. He likes neither reading nor watching TV. He feels bored and he goes to visit

启蒙运动中，最早提出人们通过社会契约创立国家的是（ �

启蒙运动中，最早提出人们通过社会契约创立国家的是（）A．霍布斯 B．洛克 C．孟德斯鸠 D．卢梭

任务性阅读 Today is Kate’s birthday and she’s fifteen. Now she

任务性阅读 Today is Kate’s birthday and she’s fifteen. Now she is with her family. Let’s meet her family. Her father’s name is Smith. He works in a hospital. People think①他

81-year-old man helped poor studentsOn December 2, 2009, in No.1 High School, Ya

81-year-old man helped poor studentsOn December 2, 2009, in No.1 High School, Yaling Town, Yichuan County, Luoyang, an old man with a stick is taking 300 notebooks and 120 ball pens out of a bag. He i

要增大CO2在水中的溶解度，可采用的方法是（） A．加压

要增大CO2在水中的溶解度，可采用的方法是（） A．加压降温 B．加压升温 C．减压降温 D．减压升温

【10乌鲁木齐市16】．（6分）我们已经学习过实验室制取一些

【10乌鲁木齐市16】．（6分）我们已经学习过实验室制取一些气体的反应原理、发生装置及收集方法，请根据下图仪器及题目要求回答问题。（1）写出

16.在下面一段文字的横线处补写恰当的语句，使整段文字语

16.在下面一段文字的横线处补写恰当的语句，使整段文字语意连贯，内容贴切，逻辑严密。每处不超过12个字。（6分）在人类文明进程里，城市的产生

设随机变量ξ的概率密度函数为f(x)= ,x∈(-∞,+∞),若η—N(0,1),则η等于

答案

相关题目

最新题目