题库大全
查看
题库大全
题库
考试培训
财会类题库
网络知识
作业答案
作业习题
蚂蚁庄园答案
当前位置:
题库大全
作业答案
一次数学测验由25道选择题构成,每道选择题有4个选项,其中有且仅有一个选项正确,选择正确答
一次数学测验由25道选择题构成,每道选择题有4个选项,其中有且仅有一个选项正确,选择正确答
发布时间:2021-02-20 13:29:07
一次数学测验由25道选择题构成,每道选择题有4个选项,其中有且仅有一个选项正确,选择正确答案得4分,不作出选择或选错不得分,满分100分.某学生选对任一题的概率为0.8,求此学生在这一次测验中的成绩的期望与方差.
网友回答
答案:
Eξ=80,Dξ=64.
以上问题属网友观点,不代表本站立场,仅供参考!
上一条:
He called up parents
下一条:
Finding that she was breat-broken的翻译
资讯推荐
给出15个数:1.2.4.7.11.-.要计算这15个数的和.现给出解决该问题的程序框图.
how to obey the school cafeteria rules 小短文
.Do you want
数据15,17,14,10,15,17,17,16,14,12的平均数为.中位数为.众数为
the price keeps ---(rise) all the time
若Amn=17×16×15×-×5×4.则( ) A.n=17.m=3B.n=17.m=4
all,his,a,the,keeps,good,time,person,promise连词成句
.给出15个数:1.2.4.7.11.-.要计算这15个数的和.现给出解决该问题的程序框图
It was sunny all the time
Look at all the corruption that's going on.It's ti
一次数学考试共有10道选择题.每道选择题都有4个选项.其中有且只有一个选项是正确的.设计试
It's raining all zhe time.So (讨厌) 用哪个词最恰当?如题、
同义句 what time shall we get to Guangzhou what time同
at the same times as为什么要加s
the boys ang girls are listening to music in the h
It's hot in the river否定形式是什么
It's too hot,let's go s
把Nobody will live without food.改为同义句
Miss Liu often helps me my english横线应该填什么?我是七下
buy的被动式词性就是被动式
we are waiting for you 怎么变同义句
for What are you waiting 连词成句(1句)
翻译句子:The rain outside the macs, like it in recount
You are eligible to purchase telephone technical s
英语翻译原文语境供参考:Any apps submitted outside this time f
technical support是什么意思
we will meet each other at ten o'clock on Thersday
She pretended_(not see)me when Ipassed by横线上填什么?
It pays to be honest
英语作文It pays to honest in the long run要求①你是如何看待生活中不
返回顶部