2. 职称英语
  3. 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  32
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://tihaiku.com/zcyy/3355679.html
相关试题推荐
随机试题
最新回复(0)