搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列关于变异系数的说法，错误的是（）

A.可以比较均数相差悬殊的几组资料的离散程度

B.可以比较计量单位不同的几组资料的离散程度

C.与标准差一样都是用来描述资料变异程度的指标，都有单位

D.变异系数的实质是同一个资料的标准差与均数的比值

E.变异系数可以用来描述正态分布资料的变异程度

答案

参考答案：C

阅读理解
下面是Tom一周的学习和工作安排时间表。请仔细阅读并选择正确答案。
　　　　　　　　　　　Tom’s Calendar
Monday
Morning: school
Afternoon: soccer practice
Evening: do my homework
Thursday
Morning: school
Afternoon: babysitting
Evening: help my parents
Tuesday
Morning: school
Afternoon: visit Uncle Li
Evening: study for the test
Friday
Morning: school
Evening: Susan’s party
Wednesday
Morning: school
Evening: do homework
Saturday：free
Sunday:  free
小题1:How many days does Tom have to go to school in a week?
A．Seven.B．Five. C．Six.D．Eight.
小题2:When does Tom go to Susan’s party?
A．Tuesday. B．Sunday. C．Friday.D．Saturday.
小题3:What is Tom doing on Thursday afternoon?
A．Visiting Uncle Li.B．Babysitting.
C．Helping his parents D．Doing homework.
小题4:Does Tom study for the test on Friday?
A．Yes, he does.B．No, he doesn’t.
C．Sorry, I don’t know.D．Yes, he doesn’t.
小题5:What does Tom do on the weekend?
A．Go to school.
B．Soccer practice.
C．He can do anything he wants to do.
D．He does nothing.
查看答案
单项选择题

下列销售的应税消费品中，不得列入加权平均计算的是( )。

A．当月伺类消费品各期销售价格高低不同的

B．销售价格明显偏低又无正当理由的

C．有销售价格的

D．均不符合要求
查看答案