新SAT官方Daily Practise每日一题数学推理题

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6月官方Daily Practice 每日一练数学，点击进入

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.

重点单词：

deviation [di:vi'eiʃən] n. 偏差数，偏离，出轨，背盟

determined [di'tə:mind] adj. 坚毅的，下定决心的

multiple ['mʌltipl] adj. 许多，多种多样的

variability [.vɛəriə'biliti] n. 易变，变化性，变异性

spread [spred] v. 伸展，展开，传播，散布，铺开，涂撒

tend [tend] v. 趋向，易于，照料，护理

variation [.vɛəri'eiʃən] n. 变化，变动，变种，变奏曲

variable ['vɛəriəbl] adj. 可变的，易变的

（答案及解析见下一页）