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SAT官方每日一题附答案和解析[数学](2015年1月16日)

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答案:A

解析:

Drawing the vertical line "Number of Items = 10" and the horizontal line "Total Cost = "$20" divides the scatterplot into four regions, as shown in the figure below.

pic 2

The lower right region lies below the line "Total Cost = $20" and to the right of the line "Number of Items = 10." Thus the points in this region are exactly the points that represent a purchase of more than 10 items at a total cost of less than $20. (Note that the points on the line "Number of Items = 10" represent a purchase of exactly 10 items, not more than 10 items and, thus, do not meet the given conditions.) There are four points in the lower right region. Therefore, four of the customers bought more than 10 items and spent less than $20.

重点单词   查看全部解释    
figure ['figə]

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n. 图形,数字,形状; 人物,外形,体型
v

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horizontal [.hɔri'zɔntl]

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adj. 水平的,横的
n. 水平线,水平面

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multiple ['mʌltipl]

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adj. 许多,多种多样的
n. 倍数,并联

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purchase ['pə:tʃəs]

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vt. 买,购买
n. 购买,购买的物品

 
vertical ['və:tikəl]

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adj. 垂直的,顶点的,纵向的
n. 垂直物

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