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
6
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
Today’slectureisonthesubjectofPronunciationAchievementFactors.
Communicationbetweenayoungcoupleisasharpbusiness.sharp——delicate/difficu
卫生法规的基本原则包括()A.卫生保护原则 B.预防为主原则 C.具有
女婴,日龄10天,精神萎靡,吮奶少,哭声低。查体:T38.8℃,前囟平,颈、胸部
合成洗涤剂、杀虫剂、病原微生物等污染属于()。A、工业污染源 B、生活污染源
A.12 B.10 C.8 D.4
口渴会促使人作出觅水的行为活动,这是动机的()。A、指向功能 B、激活功
发行人董事、监事、高级管理人员在()内曾发生变动的,应披露变动情况和原因。A:
患儿6岁,发热、头痛、恶心5天,伴抽搐、意识障碍2天,于2001年8月10日入院
最新回复
(
0
)