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SAT官方逐日一题附答案和解析[数学](2019年9月20日)

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Mathematics>Standard Multiple Choice

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.

重点单词   检查全部解释    
variation [.vɛəri'eiʃən]

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n. 变更,更改,变种,变奏曲

 
multiple ['mʌltipl]

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adj. 很多,多种多样的
n. 倍数,并联

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variability [.vɛəriə'biliti]

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n. 易变,变更性,变异性

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deviation [.di:vi'eiʃən]

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n. 误差数,偏离,出轨,背盟

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tend [tend]

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v. 趋势,易于,照顾,护理

 
determined [di'tə:mind]

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adj. 刚毅的,下定决计的

 
spread [spred]

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v. 舒展,展开,传播,分布,铺开,涂撒
n.

 
variable ['vɛəriəbl]

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adj. 可变的,易变的
n. 变量,易变的东

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