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
请教PREP里的数学题4-4The residents of Town X participated in a surv
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