首页
登录
职称英语
The distribution of the numbers of hours that students at a certain college stud
The distribution of the numbers of hours that students at a certain college stud
游客
2024-01-12
55
管理
问题
The distribution of the numbers of hours that students at a certain college studied for final exams has a mean of 12 hours and a standard deviation of 3 hours. Which of the following numbers of hours are within 2 standard deviations of the mean of the distribution?
Indicate all such numbers.
A 2
B 5
C 10
D 14
E 16
F 20
选项
答案
C,D,E
解析
Given that the mean of the distribution is 12 hours and the standard deviation is 3 hours, the numbers of hours within 2 standard deviations of the mean are all numbers of hours between 12 - 2(3), or 6, and 12 + 2(3), or 18. Thus the correct answer consists of Choices C, D, and E.
This explanation uses the following strategy.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
转载请注明原文地址:https://www.tihaiku.com/zcyy/3355679.html
相关试题推荐
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Manyschoolteacherssaythatasdifficultastheirstudentscanbetodealw
Allthereferencebooksshouldbemade______totheteachersandstudentsinour
______ofthestudentsinourclassarefromthenorth.A、TwoninthB、Secondnint
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
随机试题
It______withoutsayingthatconsumerswouldbehappierifpriceswerelower.A、ta
TheyshouldbewrittenafterthecorrespondingnumbersontheAnswerSheet.
A—statebankB—investmentbankC—commercialbank
Parentswhohaveanadoptedchildwanttoknow______.[br]Whichofthefollowi
Ourknowledgeaboutthehealthoflivingdolphinpopulationsissadlyincomp
Thereasonfruitsandvegetablesaresoimportanttoyouroverallhealthis
OGFC属于骨架-空隙结构,具有较好的高温稳定性,但耐久性较差。()
简述人的心理过程及其相互关系。
根据审计法的规定,我国审计机关的职责有( )。A.对中央银行的财务收支进行审计
某孕妇,近来常感疲乏,并有牙眼肿胀,刷牙出血,牙齿松动,皮下常有小出血点,该孕妇
最新回复
(
0
)