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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?
答案:D
问题:请问老师这题解题思路,谢谢老师! 查看答疑
问题:为什么选D呢?感觉题目的意思没理解清楚~ 查看答疑

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