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SAT官方每日一題附答案和解析[數學](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.

重點單詞   查看全部解釋    
variation [.vɛəri'eiʃən]

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n. 變化,變動,變種,變奏曲

 
multiple ['mʌltipl]

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adj. 許多,多種多樣的
n. 倍數,并聯

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variability [.vɛəriə'biliti]

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n. 易變,變化性,變異性

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deviation [.di:vi'eiʃən]

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n. 偏差數,偏離,出軌,背盟

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tend [tend]

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v. 趨向,易于,照料,護理

 
determined [di'tə:mind]

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adj. 堅毅的,下定決心的

 
spread [spred]

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v. 伸展,展開,傳播,散布,鋪開,涂撒
n.

 
variable ['vɛəriəbl]

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adj. 可變的,易變的
n. 變量,易變的東

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