作业帮请教PREP里的数学题4-4
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请教PREP里的数学题4-4
The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching TV.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 TV last week was between 1 and 2 standard deviation below the mean.Which of the following could be the number of hours that Pat watched TV last week?302018126
The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching TV.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 TV last week was between 1 and 2 standard deviation below the mean.Which of the following could be the number of hours that Pat watched TV last week?302018126
这个题其实不是考 “standard deviation",而是简单的加减法题目意思就是说 Pat 看电视的时间比大家看电视的平均时间少 1 到 2 某某值.(这个某某值正好是 standard deviation,并且其具体的数值是 6）所以 Pat 的时间就是在 21-6 跟 21-2*6 之间 答案D 查看原帖