# SAT官方每日一题附答案和解析[数学](2019年9月20日)

Mathematics>Standard Multiple Choice

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 查看全部解释 variation [.vɛəri'eiʃən] 想一想再看 n. 变化，变动，变种，变奏曲 multiple ['mʌltipl] 想一想再看 adj. 许多，多种多样的n. 倍数，并联 联想记忆 variability [.vɛəriə'biliti] 想一想再看 n. 易变，变化性，变异性 联想记忆 deviation [.di:vi'eiʃən] 想一想再看 n. 偏差数，偏离，出轨，背盟 联想记忆 tend [tend] 想一想再看 v. 趋向，易于，照料，护理 determined [di'tə:mind] 想一想再看 adj. 坚毅的，下定决心的 spread [spred] 想一想再看 v. 伸展，展开，传播，散布，铺开，涂撒n. variable ['vɛəriəbl] 想一想再看 adj. 可变的，易变的n. 变量，易变的东 联想记忆
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