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[Problem Solving]
试题详情
题目：
The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching television. The distribution of the results of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean.
Which of the following could be the number of hours that Pat watched television last week?
选项:
A、30
B、20
C、18
D、12
E、6
答案:
D
提问：
请问老师这题解题思路，谢谢老师！
解答：
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提问：
请问老师这题解题思路，谢谢老师！
解答：
点赞1
阅读1075
提问：
为什么选D呢？感觉题目的意思没理解清楚～
解答：
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