新SAT官方Daily Practise每日一题数学推理题

小站教育2017-06-05 11:30:17

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摘要：今天起，本系列将给大家带来SAT官方的每日一练真题，各个项目都有，持续更新，希望大家同步多练习。今天这里分享的是6月5日的数学推理题，一起来练习吧！

答案：D

解析：

Choice D is correct. In a data set, standard deviation measures the amount of dispersion(variation) from the mean (average). A low standard deviation indicates that the data points tend to be close to the mean (low variability) and a high standard deviation indicates that the data points are more spread out relative to the mean (high variability).

Because the standard deviation of the heights of the students in Juan's math class (3.2 inches)is less than the standard deviation of the heights of the students in his English class (6.1inches), it can be determined that the heights of the students in his math class have less variability than the heights of the students in his English class.

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