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为了同学们能够更好的复习SAT考试并加强习题锻炼，澳际留学小编每天会给大家整理一到SAT官网每日一题。今天，给小主们准备的是SAT数学真题，话不多说，赶紧看看吧。希望每天的坚持可以对同学们有所帮助。
Read the following SAT test question and then click on a button to select your answer.
The mean height of the students in Juan's math class is equal to the mean height of the students in his English class. However, while the standard deviation of the heights of students in his math class is 3.2 inches, the standard deviation of the heights of students in his English class is 6.1 inches. Which of the following statements must be true?
A. The mean height of the students in Juan's English class is 2.9 inches greater than the mean height of the students in his math class.
B. The median height of the students in Juan's English class is 2.9 inches greater than the median height of the students in his math class.
C. The median height of the students in Juan's math class is 2.9 inches greater than the median height of the students in his English class.
D. The heights of the students in Juan's math class are less variable than the heights of the students in his English class.
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 is less than the standard deviation of the heights of the students in his English class (6.1 inches), 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.
以上就是澳际留学小编今天给大家整理的2016年8月sat真题每日一练之数学真题，与大家共享，大家好才是真的好嘛。澳际留学小编希望每天坚持提供一道试题可以帮助同学们顺利通过考试。出国留学，澳际教育一直在!
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